Donald J. Trump is inaugurated as the 45th President of the United States.

Millions of people around the world participate in the Women's March, the largest single-day march in U.S. history, to protest Trump administration and its politics.

In one of his first policy decisions, President Trump decides to reinstate the "Mexico City Policy" a ban on aid to international groups performing or counseling on abortion, President Ronald Reagan first introduced this ban 1984 at a U.N conference in Mexico City, and U.S. presidents have consistently rescinded reinstate since.

President Trump directs the office of the US trade representatives to withdraw the United States from the Trans-Pacific Partnership.

President Trump signs an executive order that denies entry into the United States for people from Iran, Iraq, Libya, Somalia, Sudan, Syria, and Yemen, and suspends the Refugee Admissions Policy for 120 days. Trump’s travel ban sparks large protests and legal challenges. As a result of legal challenges, Trump revises the executive order.

The House of Representatives impeaches President Trump on two articles of impeachment: abuse of power (230-197) and obstruction of Congress (229-198). Trump becomes the third US president to be impeached (along with Andrew Johnson in 1868 and Bill Clinton in 1998).