WASHINGTON - Donald John Trump swore the oath of office Friday as the 45th president of the United States, one of the most polarizing figures to assume the office shouldering a promise to reclaim prosperity for millions who have felt abandoned by their government.

Trump, who won the presidency by smashing nearly every convention in politics, celebrated one of the most solemn and sober rituals in American democracy, a peaceful transfer of power that culminated with him ascending to an office that few thought was within his grasp.

In his 16-minute inaugural address, Trump painted a stark portrait of a country hobbled by lost jobs and threats from terrorism and immigrants.

"This American carnage stops right here and stops right now," Trump said.

In a speech that had the overtones of his divisive campaign rhetoric, he spoke as well of giving power from politicians back to their constituents.

"We are transferring power from Washington, D.C., and giving it back to you, the people," he said. "The forgotten men and women of our country will be forgotten no longer."

He made history on many levels Friday. At 70, he is the oldest president to begin a first term. The brash business mogul also became the only commander in chief to enter the White House with neither government nor military service. And while his predecessors included a screen actor and several war heroes, none became international celebrities in the era of reality television.