LONDON — The arrival of a new American president triggered joy and jubilation yesterday in a world made weary by warfare, recession and fear.

Bulls and goats were slaughtered for feasts in Kenya, toasts were offered at black-tie balls in Europe and shamans in Latin America chanted Barack Obama's name with reverence.

From Kenya and Indonesia, where Obama has family ties, to Asia, Europe, Africa and Latin America, his inauguration sparked a volcanic explosion of hope for better days ahead.

The ascendance of the first African-American to the presidency of the United States was heralded as marking a new era of tolerance and possibility.

Nelson Mandela, the former South African president who also inspired millions, sent a letter to Obama on his inauguration day.

"Your election to this high office has inspired people as few other events in recent times have done," Mandela wrote. "Amongst many around the world, a sense of hopelessness had set in as so many problems remain unresolved and seemingly incapable of being resolved. You, Mister President, have brought a new voice of hope that these problems can be addressed and that we can in fact change the world and make of it a better place."

The anti-apartheid icon's sentiment was echoed in much of the world.

Alex Andrade, a 24-year-old unemployed black Brazilian, said Obama's rise has inspired Brazil's poor.

"Blacks face so much discrimination here," he said, standing outside the Cantagalo slum, where ramshackle shacks line steep hills in Rio de Janeiro. "Now with a black man in charge of such an important country, it might help decrease the racism in Brazil."

It was a reflection of Obama's sprawling, complex family tree that villages in places as diverse as Ireland and Kenya held special parties to celebrate their link to the new president.

In Kenya, traditional dancers performed, feasts were held and movie screens were erected so neighbors could join together for the moment, only a year after their own elections were marred by horrific ethnic violence.

"Our election in Kenya really had problems with ethnicity ... America has shown that this doesn't have to be that big a problem," said Dr. Joseph Osoo, who runs a clinic in a Kenya slum. "Kenyans are very happy because their son is going to be the leader of America."

In the village of Kogelo in western Kenya, where many of Obama's Kenyan relatives live, women dressed in colorful printed cloths performed traditional dances to the rhythms of cowhide drums.

At the biggest hospital in nearby Kisumu, Christine Aoko named her newborn daughter Michelle, after Obama's wife.

"I hope my girl will grow as tough as Michelle," Aoko said.

An Irish village called Moneygall covered itself in red, white and blue bunting yesterday in honor of Obama's connections, via a great-great-great grandfather named Fulmouth Kearney who immigrated to the United States in 1850.

They also baked a special round fruitcake, locally called a "brack," to sell for the occasion — with Obama's picture on the wrapping.

In the South American country of Guyana, dozens of work sites closed at noon to let employees watch the inauguration.

"As far as I am concerned, today is a holiday," said Patrick Hazelwood, an insurance agent in Georgetown, the capital. "Today is a serious day for everybody, a historic day."

There was also jubilation in the Colombian town of Puerto Tejada, where sugarcane-cutting descendants of African slaves had the day off and watched the Washington proceedings on a giant screen.

"The people here see themselves represented in Obama," Mayor Elver Montano said.

In Peru's capital Lima, a dozen faith healers from Peru, Brazil, Mexico and Bolivia danced during the inauguration. Stomping their feet, shaking rattles and blowing smoke, they chanted Obama's name while throwing flower petals and coca leaves at his photograph.

"In ancient times, it was one of the rituals dedicated to Inca and pre-Inca rulers," shaman Juan Osco said. "Today we dedicate it from Peru to Obama, because he is the first black president, and his heart is big for the whole world."

In London, Americans could get free admission to Madame Tussaud's waxworks to see the new figure of Obama, and parties were scheduled in dozens of venues, from ritzy hotels to local sports bars.

Louise Darko from Atlanta, standing in line to be photographed with the Obama waxwork, was thrilled with Obama's inauguration because of the difficulties her great-grandfather faced when he was one of the first blacks to attend a university in the American south.

"Now when I tell my children you can grow up to be anything, I really mean it," said Darko, 44.

The group Democrats Abroad held a swanky sold-out event at London's Royal Lancaster Hotel, and American students at Cambridge University took part in an Obama lu'au.

In the Indonesian capital Jakarta, where Obama spent four years as a boy, students from his former school swayed and spun in bright, traditional costumes representing Indonesia's ethnically diverse tropical islands.

Old classmates gathered at the Menteng 1 elementary school to watch the once-chubby kid they remember as "Barry."

"I'm proud that the next president is someone who I have shared time with," said Rully Dasaad, who was a Boy Scout with Obama. "It was a crucial time for children our age, it is when we learned tolerance, sharing, pluralism, acceptance and respect of difference in cultures and religions."