US Presidential Inaugural Addresses
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The inauguration of the president of the United States is a ceremonial event marking the commencement of a new four-year term of a president of the United States. The day a presidential inauguration occurs is known as "Inauguration Day" and occurs on January 20 (or 21st if the 20th is a Sunday). (Prior to the Twentieth Amendment, the date was March 4, the day of the year on which the Constitution of the United States first took effect in 1789; the last inauguration to take place on the older date was Franklin D. Roosevelt's first one on March 4, 1933.) The most recent public presidential inauguration ceremony, the swearing in of President Barack Obama to begin his second four-year term in office, took place on Monday, January 21, 2013.
The only inauguration element mandated by the United States Constitution is that the president make an oath or affirmation before that person can "enter on the Execution" of the office of the presidency. However, over the years, various traditions have arisen that have expanded the inauguration from a simple oath-taking ceremony to a day-long event, including parades, speeches, and balls.
From the presidency of Andrew Jackson through that of Jimmy Carter, the primary Inauguration Day ceremony took place on the Capitol's East Portico.  Since the 1981 inauguration of Ronald Reagan, the ceremony has been held at the Capitol's West Front. The inaugurations of William Howard Taft in 1909 and Reagan in 1985 were moved indoors at the Capitol due to cold weather. The War of 1812 and World War II caused two inaugurations to be held at other locations in Washington, D.C.
When George Washington was inaugurated, the oath was administered by Robert Livingston, Chancellor of New York State, in 1789, and by William Cushing, Associate Justice of the Supreme Court, in 1793. Since Chief Justice Oliver Ellsworth swore in President John Adams, no chief justice has missed an Inauguration Day. When Inauguration Day has fallen on a Sunday, the chief justice has administered the oath to the president on the Sunday privately and then again the next day publicly.