Joe Biden promised to re-establish global alliances. He became the 46th U.S. President on Wednesday. There were around 25,000 National Guard troops to make sure the inauguration took place peacefully. Mr Biden will make change the direction of America's foreign policy. He will rejoin the Paris climate accord. He wants to restore America's reputation. He said: "We will repair our alliances and engage with the world once again."
Donald Trump left office and promised to "be back". His farewell words were: "Have a good life, we will see you soon." He did not attend the inauguration. Mr Trump said: "This has been an incredible four years. We've accomplished so much together." He added: "It's been a...privilege to be your president....I wish the new administration great luck and great success....They have the foundation to do something really spectacular."