Lyndon B. Johnson was the 36th President of the United States, serving from 1963 to 1969. He is known for his ambitious domestic agenda, particularly the Great Society programs aimed at eliminating poverty and racial injustice, which were responses to the growing social movements of the 1960s. His presidency was marked by significant legislation that reshaped American society and addressed the demands of civil rights activists, anti-poverty advocates, and other groups pushing for change.