Donald Trump officially sworn in as the 45th president of the United States.

The inauguration took place outside US Capitol in Washington, DC on Friday, ushering in a new political era.

"Together we will determine the course of America and the world for many, many years to come," Trump said in his inaugural speech.

"We will face challenges, we will confront hardships, but we will get the job done."

He added: "For too long a small group in our nations capital has reaped the rewards of government.Washington flourished, but the people did not share in its wealth." 

Chief Justice John Roberts administered the oath of office, which was witnessed by Trump's wife, the First Lady Melania Trump. 

Vice President Mike Pence has also been sworn in, in front of a crowd of an estimated 900,000 people.

Speaking at the inauguration, Chuck Shumer, Senator from New York, said that America is now living in a "challenging and tumultuous time" ahead of the oaths.

"Faith in our government, our institutions and even our country can erode," he said. 

"Today we celebrate one of democracy's core attributes: the peaceful transfer of power."