Lyndon B. Johnson was the 36th President of the United States, serving from 1963 to 1969. He became president after the assassination of John F. Kennedy and was known for his ambitious domestic agenda, called the "Great Society," which aimed to eliminate poverty and racial injustice. Johnson also escalated U.S. involvement in the Vietnam War, which became a controversial aspect of his presidency. His administration passed significant legislation, including the Civil Rights Act of 1964 and the Voting Rights Act of 1965, which aimed to protect the rights of African Americans and promote equality.