Trump's inauguration: 10 things you need to know.

Below we will list the key facts you should know about Trump's inauguration.

1.- This Friday, January 20, Trump and Mike Pence will be sworn in as the forty-fifth president and the forty-eighth vice president of the United States.

2.- The Department of Security and Emergency Management in Washington estimates that between 800,000 and 900,000 people will attend the celebrations in the center of the capital.

3.- Trump posted on his Twitter account that "People are going to come to Washington in record numbers," in order to fulfill what he indicated he will have to surpass the 1.8 million people who attended Barack Obama's inauguration in 2009.

4.- The official acts began this Thursday with a ceremony in which Trump and Pence laid a wreath at Arlington National Cemetery, outside Washington.