History of United States foreign policy is a brief overview of major trends regarding the foreign policy of the United States from the American Revolution to the present. The major themes are becoming an "Empire of Liberty", promoting democracy, expanding across the continent, supporting liberal internationalism, contesting World Wars and the Cold War, fighting international terrorism, developing the Third World, and building a strong world economy with low tariffs.

The Empire of Liberty is a theme developed first by Thomas Jefferson to identify what he considered the responsibility of the United States to spread freedom across the world. Jefferson saw the mission of the U.S. in terms of setting an example, expansion into western North America, and by intervention abroad. Major exponents of the theme have been James Monroe, Andrew Jackson and James K. Polk, Abraham Lincoln, Theodore Roosevelt, Woodrow Wilson (Wilsonianism), Franklin D. Roosevelt, Harry Truman, Ronald Reagan, Bill Clinton, and George W. Bush.