Johnson did not run for a second full term in the 1968 presidential election, he was succeeded by Republican Richard Nixon. His presidency marked the high tide of modern liberalism in the United States. Johnson expanded upon the New Deal with the Great Society, a series of domestic legislative programs to help the poor and downtrodden. Johnson expanded upon the New Deal with the Great Society, a series of domestic legislative programs to help the poor and downtrodden. After taking office, he won passage of a major tax cut, the Clean Air Act, and the Civil Rights Act of 1964. He also presided over major increases in federal funding to education and the end of a period of restrictive immigration laws. In response to the public demand for answers and the growing number of conspiracy theories, Johnson established a commission headed by Chief Justice Earl Warren, known as the Warren Commission, to investigate Kennedy's assassination. The commission conducted extensive research and hearings and unanimously concluded that Lee Harvey Oswald acted alone in the assassination.
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