The American Presidents: A Short History of the Office

Reference · Understanding American Government

In brief: The American presidency was created by Article II of the Constitution as a single executive elected for four-year terms. Over more than two centuries it has grown from a modest office into the center of national government, shaped by wars, crises, mass media and the people who held it. As of October 2026, 45 individuals have served as president across 47 presidencies; Donald Trump is the 47th president and JD Vance is vice president.

What does the Constitution say about the president?

Article II of the U.S. Constitution vests “the executive Power” in a president. The president is commander in chief of the armed forces, makes treaties (with the consent of two-thirds of the Senate), appoints judges and senior officials (with Senate confirmation), can veto bills, and must “take Care that the Laws be faithfully executed.”

The qualifications are short. A president must be:

• a natural-born citizen of the United States
• at least 35 years old
• a resident of the United States for at least 14 years

The president holds office “during the Term of four Years” and must take an oath to “preserve, protect and defend the Constitution of the United States.”

Two later amendments reshaped the office. The 22nd Amendment, ratified February 27, 1951, says no person may be elected president more than twice, and someone who serves more than two years of another president’s term may be elected only once. The 25th Amendment, ratified February 10, 1967, settles succession and disability: the vice president becomes president if the president dies, resigns or is removed; a vacant vice presidency is filled by presidential nomination confirmed by both houses of Congress; and procedures exist for a president to be declared temporarily unable to serve.

How did the presidency grow in power over time?

The office has expanded in stages, usually during crises or under presidents who reinterpreted their role. Historians often describe the following eras.

• The founding and Washington’s precedents (1789–1797). George Washington set customs the Constitution left open. According to the Miller Center, every president since has worked with a cabinet, and his decision to retire after two terms became an unwritten rule until Franklin Roosevelt. His voluntary departure established the peaceful transfer of power as a norm.
• Andrew Jackson (1829–1837). Jackson presented himself as the direct representative of the people against Congress. He vetoed 12 bills, more than his six predecessors combined, and used the first “pocket veto.” He also tightened presidential control over the cabinet.
• Abraham Lincoln and the Civil War (1861–1865). Lincoln used his war powers more broadly than any predecessor, including suspending habeas corpus in some areas. He issued the Emancipation Proclamation on January 1, 1863, as a wartime measure that applied to states in rebellion.
• Theodore Roosevelt’s “bully pulpit” (1901–1909). Roosevelt coined the phrase “bully pulpit” for the presidency as a platform to speak directly to the public and persuade it (“bully” meant excellent). He held that a president could use any power not specifically denied to him, and the Miller Center credits him with making the president, rather than Congress or the parties, the center of American politics.
• Franklin D. Roosevelt and the modern presidency (1933–1945). Facing the Great Depression and World War II, FDR became a chief legislator as well as chief executive. His radio “fireside chats” spoke directly to Americans, and the Executive Reorganization Act of 1939 gave the White House a permanent professional staff. He was elected four times and served from March 1933 until his death in April 1945, the longest tenure in U.S. history. That record led directly to the 22nd Amendment.
• The media and television presidency (from 1961). John F. Kennedy held the first live televised presidential news conference on January 25, 1961, watched by an estimated 65 million people. From then on, a president’s ability to communicate on camera became central to the job.
• The “imperial presidency” debate and Watergate (1960s–1970s). Historian Arthur M. Schlesinger Jr.’s 1973 book The Imperial Presidency argued that presidential power, especially in war, had outgrown constitutional limits. Congress passed the War Powers Resolution that year. The Watergate scandal led Richard Nixon to announce his resignation on August 8, 1974; it took effect at noon on August 9, when Gerald Ford was sworn in. Nixon remains the only president to resign.
• The 21st-century presidency. After the September 11, 2001, attacks, Congress passed the Authorization for Use of Military Force (Public Law 107-40), which later presidents of both parties have cited for military action against terrorist groups. Debates over executive orders, emergency powers, surveillance and the reach of presidential authority have continued through every administration since. For more on one of the main tools, see executive orders explained.

Which presidents have been impeached?

Under the Constitution, the House of Representatives impeaches (formally charges) a president by majority vote, and the Senate holds a trial presided over by the chief justice. Conviction requires two-thirds of senators present. Three presidents have been impeached, one of them twice, and the Senate acquitted in every case.

• Andrew Johnson (1868). The House impeached him on February 24, 1868. The Senate’s votes were 35 to 19 to convict, one vote short of the two-thirds required.
• Bill Clinton (1998). Impeached by the House in December 1998; acquitted by the Senate on February 12, 1999.
• Donald Trump, first impeachment (2019). Impeached by the House in December 2019; acquitted by the Senate on February 5, 2020.
• Donald Trump, second impeachment (2021). Impeached by the House in January 2021; acquitted by the Senate on February 13, 2021, after he had left office. The vote was 57 to 43 to convict, short of the 67 needed.

Richard Nixon was never impeached. He resigned in 1974 before the full House voted on articles of impeachment approved by the House Judiciary Committee.

Which presidents died in office or were assassinated?

Eight presidents have died in office. Four died of natural causes:

• William Henry Harrison (1841)
• Zachary Taylor (1850)
• Warren G. Harding (1923)
• Franklin D. Roosevelt (1945)

Four were assassinated:

• Abraham Lincoln (1865)
• James A. Garfield (1881)
• William McKinley (1901)
• John F. Kennedy (1963)

In each case the vice president succeeded to the presidency. John Tyler’s succession after Harrison’s death in 1841 set the precedent that a vice president becomes president in full, not merely an acting president, a practice the 25th Amendment later wrote into the Constitution.

Who have all the U.S. presidents been?

The table below lists every president in order, as of October 2026. Grover Cleveland served two non-consecutive terms and is counted as both the 22nd and 24th president. Donald Trump also served non-consecutive terms and is counted as the 45th and 47th. Party labels follow Encyclopaedia Britannica, with notes where a label needs context.

Trump’s second term began on January 20, 2025, with JD Vance as vice president. Under the four-year term set by Article II, it is scheduled to end on January 20, 2029.

Why do voters project their hopes and fears onto presidents?

The presidency is the one national office every American votes for, and it is personified in one individual. That makes it a natural focus for emotion. Voters often judge the country’s direction through the person in the Oval Office, crediting or blaming the president for conditions, such as the economy, that the office only partly controls. This is a core topic in political psychology.

Psychologists have studied presidential personality directly. In research presented at the American Psychological Association’s 2000 convention, Steven Rubenzer, Thomas Faschingbauer and Deniz Ones had more than 100 experts rate every president’s personality and compared the results with historians’ greatness rankings. They reported that presidents rated as great tended to score higher on extraversion, assertiveness, achievement-striving and openness to experience. Psychologist Dean Keith Simonton, in a 2006 study in Political Psychology, estimated intelligence and openness for 42 presidents and found these traits correlated with historians’ assessments of leadership performance.

Public feeling toward presidents also shifts with events. Political scientist John Mueller introduced the term “rally-round-the-flag” in the early 1970s for the short-lived jump in approval that follows a sudden, dramatic international crisis. The largest recorded example came after September 11, 2001, when George W. Bush’s Gallup approval rose from 51% to 86%. Such rallies usually fade as ordinary partisan divisions return.

For how public opinion of presidents has moved over the decades, see our history of presidential approval ratings. For commentary on the psychology of one modern presidency’s supporters, see the psychology of Trump supporters, 2016–2024–2026, and browse more in our politics commentary.

Key takeaways

• Article II creates a single president who must be a natural-born citizen, at least 35, and a 14-year resident, serving four-year terms; the 22nd Amendment (1951) limits presidents to two elections, and the 25th (1967) governs succession and disability.
• Presidential power grew in stages: Washington’s precedents, Jackson’s popular mandate, Lincoln’s war powers, Theodore Roosevelt’s bully pulpit, FDR’s modern presidency, the television era, and post-9/11 executive power.
• Three presidents have been impeached (Andrew Johnson, Bill Clinton, and Donald Trump twice), and the Senate acquitted each time; Nixon resigned in 1974 before a House vote.
• Eight presidents have died in office, four of them by assassination.
• As of October 2026, Donald Trump is the 47th president, having also served as the 45th, and JD Vance is vice president.

More in Understanding American Government

• Executive Orders Explained: What They Are and How They Work
• Presidential Approval Ratings Through History
• Landmark Laws That Shaped America
• Treaties and International Agreements: How the U.S. Makes Them

Sources

• Article II, Section 1 — Constitution Annotated, Congress.gov
• The Constitution: Amendments 11–27 — National Archives
• Impeachment Cases — U.S. Senate
• The Impeachment of Andrew Johnson — U.S. Senate
• U.S. Presidents — Miller Center, University of Virginia
• Presidents of the United States — Encyclopaedia Britannica
• Nixon Resigns — National Archives, The Text Message / Prologue blog
• JFK Meets the Press — John F. Kennedy Presidential Library
• The Constituent Foundations of the Rally-Round-the-Flag Phenomenon — Matthew A. Baum, International Studies Quarterly
• Personality of Every President in American History — American Psychological Association via Newswise

Part of the brossi.us reference library, written for readers of Dr. Bart Rossi, PhD. Last reviewed October 2026.