The 36th President of the United States was Lyndon B. Johnson, who served from 1963 to 1969. He became president after the assassination of John F. Kennedy and was later elected to a full term. Johnson is known for his ambitious domestic agenda, which included the Great Society programs aimed at eliminating poverty and racial injustice. Johnson's presidency also saw significant legislation, such as the Civil Rights Act of 1964 and the Voting Rights Act of 1965. However, his time in office was marred by the escalating conflict in Vietnam, which led to widespread protests and criticism of his administration.