Lyndon B. Johnson played a significant role in Black history during his presidency from 1963 to 1969. Johnson was a critical figure in advancing civil rights legislation in the United States. One of his most notable achievements was the passage of the Civil Rights Act of 1964, which outlawed discrimination based on race, color, religion, sex, or national origin.

Johnson also signed the Voting Rights Act of 1965 into law, which aimed to overcome legal barriers at the state and local levels that prevented Black Americans from exercising their right to vote as guaranteed by the 15th Amendment to the U.S. Constitution.

Additionally, Johnson was instrumental in launching the "War on Poverty" programs, which aimed to address and alleviate poverty in the United States, disproportionately impacting Black communities.

Overall, Lyndon B. Johnson's presidency made significant strides in advancing civil rights and economic opportunities for Black Americans during the turbulent 1960s.