The United Nations marked its 75th anniversary Monday with its chief urging leaders of an increasingly polarized, go-it-alone world to work together and preserve the organization’s most important success since its founding: avoiding a military confrontation between the major global powers.

Secretary-General Antonio Guterres’ appeal for a revival of multilateralism — the foundation of the United Nations — was echoed by leaders of countries large and small, rich and poor.

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Member state flags fly outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York.  With the COVID-19 pandemic still circling the globe, world leaders are skipping their annual gathering in New York and will make pre-recorded speeches this week on the state of a deeply divided world turned topsy-turvy. (AP PhotoMary Altaffer)

The United Nations marked its 75th anniversary Monday with its chief urging leaders of an increasingly polarized, go-it-alone world to work together and preserve the organization’s most important success since its founding: avoiding a military confrontation between the major global powers.

In this photo provided by the United Nations, United Nations General Assembly President Volkan Bozkir, from Turkey, seated at left on dais, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (Eskinder DebebeUnited Nations via AP)

“Today, we have a surplus of multilateral challenges and a deficit of multilateral solutions,” the U.N. chief said, stressing that COVID-19 has “laid bare the world’s fragilities,” which can only be addressed together.

A woman wearing a face mask to protect against the coronavirus walks past artwork and metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

The United Nations marked its actual 75th anniversary — the charter's signing in San Francisco on June 26, 1945 — at an event scaled down because of the pandemic.

In this photo provided by the United Nations, President of the International Court of Justice, Judge Abdulqawi Ahmed Yusuf, is seen on screens as he addresses the United Nations General Assembly to commemorate the 75th anniversary of the United Nations. (Manuel ElíasUnited Nations via AP)

In a snub to the United Nations, the United States instead was represented by its acting deputy U.N. ambassador, Cherith Norman Chalet. The White House had no immediate comment.

United Nations General Assembly President Volkan Bozkir, of Turkey, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (UN PhotoManuel Elías via AP)

China’s Xi urged U.N. members to recommit to multilateralism and “work to promote a community with a shared future for mankind.”

Pedestrians and traffic make their way past metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. Security measures have been downscaled outside the United Nations ahead of this year's General Assembly. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

But he warned that “our common home is in disarray, just like our world.”

But despite largely positive speeches, it was clear that challenges lie ahead in collaborating to beat back the coronavirus pandemic, end numerous smaller conflicts from the Middle East to Africa, and achieve U.N. goals to eradicate extreme poverty and preserve the environment by a 2030 target.

Member state flags fly outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York.  With the COVID-19 pandemic still circling the globe, world leaders are skipping their annual gathering in New York and will make pre-recorded speeches this week on the state of a deeply divided world turned topsy-turvy. (AP PhotoMary Altaffer)

Member state flags fly outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. With the COVID-19 pandemic still circling the globe, world leaders are skipping their annual gathering in New York and will make pre-recorded speeches this week on the state of a deeply divided world turned topsy-turvy. (AP PhotoMary Altaffer)

“Today, we have a surplus of multilateral challenges and a deficit of multilateral solutions,” the U.N. chief said, stressing that COVID-19 has “laid bare the world’s fragilities,” which can only be addressed together.

“Climate calamity looms, biodiversity is collapsing, poverty is rising, hatred is spreading, geopolitical tensions are escalating, nuclear weapons remain on hair-trigger alert,” Guterres said.

Appealing for a new multilateralism that draws on civil society, cities, businesses, local authorities and young people, Guterres said “no one wants a world government — but we must work together to improve world governance.”

In this photo provided by the United Nations, United Nations General Assembly President Volkan Bozkir, from Turkey, seated at left on dais, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (Eskinder DebebeUnited Nations via AP)

In this photo provided by the United Nations, United Nations General Assembly President Volkan Bozkir, from Turkey, seated at left on dais, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (Eskinder DebebeUnited Nations via AP)

The United Nations marked its actual 75th anniversary — the charter's signing in San Francisco on June 26, 1945 — at an event scaled down because of the pandemic.

Monday’s mainly virtual official commemoration wasn't a celebration but a sobering assessment of the state of the world, the impact of the 193-member world body over seven decades and the struggles ahead. Some leaders appeared in native dress and in unusual settings, adding some color to prerecorded speeches.

As a sign of the commemoration’s importance, heads of government like Chinese President Xi Jinping and French President Emmanuel Macron spoke. U.S. President Donald Trump was first on the list of 182 speakers, but he didn't offer remarks.

A woman wearing a face mask to protect against the coronavirus walks past artwork and metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

A woman wearing a face mask to protect against the coronavirus walks past artwork and metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

In a snub to the United Nations, the United States instead was represented by its acting deputy U.N. ambassador, Cherith Norman Chalet. The White House had no immediate comment.

“In many ways, the United Nations has proven to be a successful experiment,” Chalet said. But for too long, she added, it has resisted “meaningful reform,” lacked transparency and been “too vulnerable to the agenda of autocratic regimes and dictatorships.”

“New threats require new agility from the U.N.,” she said, citing theft of intellectual property and efforts to “undermine internet freedom.”

In this photo provided by the United Nations, President of the International Court of Justice, Judge Abdulqawi Ahmed Yusuf, is seen on screens as he addresses the United Nations General Assembly to commemorate the 75th anniversary of the United Nations. (Manuel ElíasUnited Nations via AP)

In this photo provided by the United Nations, President of the International Court of Justice, Judge Abdulqawi Ahmed Yusuf, is seen on screens as he addresses the United Nations General Assembly to commemorate the 75th anniversary of the United Nations. (Manuel ElíasUnited Nations via AP)

China’s Xi urged U.N. members to recommit to multilateralism and “work to promote a community with a shared future for mankind.”

“Unilateralism is a dead end,” he said. “No country has the right to dominate global affairs, control the destiny of others or keep advantages in development all to itself. Even less should one be allowed to do whatever it likes and be the hegemon, bully or boss of the world.”

Macron said the United Nations has remained true to its promises made three-quarters of a century ago: “To save future generations from the scourge of war, to assert human rights and the equality of nations, and to promote social progress in greater freedom.”

United Nations General Assembly President Volkan Bozkir, of Turkey, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (UN PhotoManuel Elías via AP)

United Nations General Assembly President Volkan Bozkir, of Turkey, addresses the United Nations General Assembly, to commemorate the 75th anniversary of the United Nations, Monday, Sept. 21, 2020. (UN PhotoManuel Elías via AP)

But he warned that “our common home is in disarray, just like our world.”

“Faced with the health emergency, faced with the climate challenge, faced with the decline in rights," Macron said, “it is here and now that we have to act, with those who want to and with those who can, by exploiting all possible spaces for cooperation.”

Guterres and many others said the founding of the United Nations in 1945 and the commitment to cooperation after two world wars and the Holocaust produced results.

Pedestrians and traffic make their way past metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. Security measures have been downscaled outside the United Nations ahead of this year's General Assembly. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

Pedestrians and traffic make their way past metal barricades lining the sidewalk outside the United Nations headquarters, Friday, Sept. 18, 2020, in New York. Security measures have been downscaled outside the United Nations ahead of this year's General Assembly. As the COVID-19 pandemic continues to wreak havoc across the globe, the annual meeting of member states has been scaled back, with the majority of delegates addressing the assembly from remote locations. (AP PhotoMary Altaffer)

“Never in modern history have we gone so many years without a military confrontation between the major powers,” the secretary-general said. “This is a major achievement of which member states can be proud — and which we must all strive to preserve.”

Guterres cited other major U.N. victories over 75 years: peace treaties, decolonization, setting human rights standards, the end of apartheid in South Africa, eradication of diseases, a reduction in hunger, development of international law and landmark pacts to protect the environment.

But 25 years after world leaders adopted a platform to achieve equality for women, he said “gender inequality remains the greatest single challenge to human rights around the world.”

German Chancellor Angela Merkel stressed that “the United Nations can be only as effective as its members are united” and urged new efforts “to do everything in our power” to find common responses and end “the most intractable security issues,” including conflicts in Libya and Syria.

Guyana’s President Irfaan Mohamed Ali, the head of what’s called the Group of 77 and China — the main U.N. bloc of developing countries that now has 134 member states — said the commemoration “must send a strong and positive signal to the peoples of the world of our commitment to multilateralism and our resolve to strive for peace, justice and development.”

Echoing broader global concerns, the president of Equatorial Guinea, Teodoro Obiang, said, “There is no justification for the huge economic gap between rich and poor countries today.”

Similarly, Seychelles President Danny Faure warned that issues like climate change know no borders.

“I assure you that the smallest, poorest and weakest of nations can contribute ideas as innovative ... as the biggest, wealthiest and most powerful countries,” Faure said.

Diplomats from the 193 U.N. member nations managed to agree after sometimes difficult negotiations on a declaration to mark the U.N.’s anniversary, which was adopted Monday. It recalls the body's successes and failures and vows to build a post-pandemic world that is more equal, works together and protects the planet.

Richard Gowan, U.N. director for the Crisis Group, a Brussels-based think tank, said the declaration was weakened by the U.S. opposing strong language on climate change and Britain and others objecting to China trying to insert language including its hallmark phrase, “win-win.”

President Xi used it Monday in speaking about “Cold War mentality,” declaring “what we need to do is to replace conflict with dialogue, coercion with consultation and zero-sum with win-win.”

Gowan said the dispute over the declaration was minor but “captures the real question that has emerged over the U.N. in 2020, exacerbated by COVID, which is: How is this organization going to navigate an era of U.S.-China tension?”

Amid those questions, the U.N. released results of “a global conversation” it launched in January, using surveys, polls and gatherings to determine what all kinds of people thought about the future.

Guterres said the U.N.'s 75th anniversary is an ideal time to realize goals that were expressed, including speeding up the transition to zero carbon emissions, ensuring universal health coverage and ending racial injustice.

“We face our own 1945 moment,” he said. “We must meet that moment. We must show unity like never before to overcome today’s emergency, get the world moving and working and prospering again.”

Cara Anna contributed to this report from Johannesburg and Angela Charlton from Paris.

Longtime international correspondent Edith M. Lederer has been chief U.N. correspondent for The Associated Press since 1998. Follow her on Twitter at http://twitter.com/EdithLedererAP