With counting continuing in some states, Biden had already received more than 74 million votes, more than any presidential candidate before him.
As for the president-elect, he said he is honoured that America has chosen him as the leader of the countrey.
"With regard to the USA election, we are going to wait until all the legal matters have been resolved", Lopez Obrador said at a news conference.
Writing on Twitter, Rousseff, who was Brazil's first female president, also congratulated Kamala Harris for becoming the first black woman to be United States vice president. "Cherokee Nation's hand of friendship remains extended and our resolve that the United States honor its promises to Indian Country remains firm".
"We look forward to working with President-elect Biden's transition team and future administration to ensure that this vital economic partnership continues". "God Bless Kamala and her family for this personal and historic milestone". Donald Trump can cry and whine about the outcome, but soon he'll have to do it at one of his fledgling resorts.
Obama who campaigned massively for Biden, who once served side-by-side with him said, "I could not be prouder to congratulate our next President, Joe Biden, and our next First Lady, Jill Biden".
Canadians are also sharing how they felt about Biden becoming the next U.S. president.
Biden's triumph came in the midst of a series of last-minute legal actions taken by the Trump campaign, seeking to halt the processing and counting of mail-in ballots in some contentious swing states while pushing for a recount in others.
CNN, Fox News and other channels had not yet decided the election in Biden's favor when Trump set off to play golf on Saturday morning.
The FBI said in a statement: "The FBI works closely with our federal, state, and local law enforcement partners to identify and stop any potential threats to public safety".
"We did it. We did it, Joe", a beaming Ms Harris tells Mr Biden in the footage. To date there has been no evidence to substantiate Trump's claims of voter fraud.
A number of Trump's tweets claiming electoral fraud have been marked with an alert from the social media giant in the wake of the election result.
Yannh Djedjro, a 32-year-old who works in software and came to BLM Plaza with his fiancee and baby daughter, said: "I think it's incredible".
"I wasn't nervous, I was very calm".
The Trump campaign's general counsel, Matt Morgan, asserted in a statement that the elections in Georgia, Nevada and Pennsylvania all suffered from improprieties and that Mr Trump would eventually prevail in Arizona. There is no evidence of any kind of voter fraud.
"I'm here to celebrate", said Jack Nugent, a 24-year-old software engineer as he walked to Black Lives Matter Plaza, a newly christened area near the presidential mansion that was the epicenter of protests this summer about racial injustice, on an unusually hot and sunny November day.
He later tweeted: "I WON THIS ELECTION, BY A LOT!" The tweet was labeled misleading by Twitter moderators, one of dozens that have been flagged as potentially false in recent days.
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