LONDON — The arrival of a new American president triggered joy and jubilation 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 Barack Obama has family ties, to Asia, Europe, Africa and Latin America, Obama's 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."

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.

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

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. "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 Sweden, African-American singer Cyndee Peters hosted a "A Gala for Obama," featuring dozens of Swedish soul, jazz, gospel and blues artists.

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.