President-elect prepares to be sworn in as Biden era comes to an end - Donald Trump will succeed Joe Biden in the White House from January 20, when he takes the oath of office in Washington D.C

For more than 100 years, the US did not inaugurate its president until March - a four month wait for the official handing over of power. That changed in 1933 during the Great Depression economic crisis, when Inauguration Day moved from 4 March 4 to 20 January - with the ratification of the 20th amendment to the US Constitution.