Obama hails 'first pope from the Americas'

US President Barack Obama offered "warm wishes" on behalf of the American people to newly elected Pope Francis I on Wednesday, hailing the Argentine as "the first pope from the Americas."

"As a champion of the poor and the most vulnerable among us, he carries forth the message of love and compassion that has inspired the world for more than two thousand years, that in each other we see the face of God," Obama said.

Argentina's Cardinal Jorge Mario Bergoglio, the archbishop of Buenos Aires, was elevated to the papacy by the College of Cardinals, who met at the Vatican to choose a successor to Pope Benedict XVI who resigned last month.

In Argentina, he is seen as a modest figure, true to his working class roots, and as a moderate theologian. He is also the first ever pope from Latin America and the first non-European to take the post in centuries.

"On behalf of the American people, Michelle and I offer our warm wishes to His Holiness Pope Francis as he ascends to the Chair of Saint Peter and begins his papacy," Obama said in a statement issued by the White House.

"His selection also speaks to the strength and vitality of a region that is increasingly shaping our world, and alongside millions of Hispanic Americans, those of us in the United States share the joy of this historic day," Obama added.

"Just as I appreciated our work with Pope Benedict XVI, I look forward to working with His Holiness to advance peace, security and dignity for our fellow human beings, regardless of their faith."

Obama and his family are Protestant Christians, sharing the faith of about half of US citizens.

Around a quarter of Americans are Roman Catholics, or around 80 million people, the fourth largest national group in the Church.