Short answers, pulled from the story.
Lyndon B. Johnson became president on the 22nd of November 1963, following the assassination of John F. Kennedy in Dallas, Texas. He was sworn in aboard Air Force One by District Court judge Sarah T. Hughes, serving as president until the 20th of January 1969.
The Great Society was Johnson's domestic policy agenda aimed at expanding civil rights, healthcare, education, urban renewal, environmental protection, and anti-poverty programs. Key achievements included the creation of Medicare and Medicaid in 1965, the Economic Opportunity Act of 1964, and a doubling of federal education spending through the Elementary and Secondary Education Act of 1965.
Johnson signed the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Fair Housing Act as part of the Civil Rights Act of 1968. The Voting Rights Act raised African-American voter registration in Mississippi from 6.7 percent to 59.8 percent between 1964 and 1967.
Johnson initially sought re-election in 1968 but withdrew after disappointing results in the New Hampshire primary. His approval had fallen sharply due to public frustration with the Vietnam War, urban unrest, and what critics called the credibility gap between his public statements and the war's reality.
Johnson was declared winner of the 1948 Democratic Senate primary in Texas by just 87 votes out of 988,295 cast. Election judge Luis Salas stated in 1977 that he had certified 202 fraudulent ballots from Jim Wells County's Box 13, with 200 of them for Johnson. Biographer Robert Caro argued in his 1990 book that thousands of additional fraudulent votes existed in other counties.
During the Johnson administration, the percentage of Americans living below the poverty line dropped from 23 percent to 12 percent. Programs created under the Economic Opportunity Act of 1964 included the Job Corps, VISTA, and the establishment of Community Action Agencies across the country.