In 1963, Lyndon B Johnson assumed the presidency upon the assassination of John F. Kennedy.

John F. Kennedy's assassination on Nov. 22, 1963, led to Lyndon B. Johnson's ascension to the presidency.

Johnson won the 1964 presidential election in a landslide after completing Kennedy's term.

Johnson was born on Aug. 27, 1908, in Texas.

Johnson, after graduating from Southwest Texas State Teachers College (now Texas State University in San Marcos), served in the Navy during World War II as a lieutenant commander and was awarded a Silver Star for his service.

In September 1934, Johnson met Claudia Alta "Lady Bird" Taylor and married her in November of that year, according to the LBJ Library website. They had two daughters, Lynda and Luci, who both hosted guests at the White House for their own weddings.

In 1948, after serving six terms in the House, Johnson was elected to the Senate.

According to the LBJ Library website, he served in the Senate for 12 years and was elected as the Democrat whip. He later became the Democrat minority leader in 1953.

In the 1960 presidential election, Kennedy selected Johnson as his running mate. Kennedy won the election by a narrow margin over Nixon, who was the incumbent Republican vice president.

On Air Force One, Johnson was inaugurated as president on Nov. 22, 1963, following the assassination of Kennedy.

Johnson, upon assuming the presidency, prioritized passing bills that were backed by Kennedy, with a significant emphasis on tax cuts and the Civil Rights Act.

In 1964, Johnson won the presidency with Humphrey as his running mate, defeating Goldwater and earning 61% of the popular vote, which was equivalent to over 15,000,000 votes, as per the LBJ Library.

Johnson, during his presidency, enacted several bills that safeguarded the rights of African Americans, including the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Civil Rights Act of 1968.

The Medicare Amendment to the Social Security Act was signed into law by him in 1965, providing medical care to millions of seniors.

During his time in the White House and after his presidency, Johnson played a significant role in space exploration. In 1968, astronauts orbited the moon on Apollo 8, marking the first time humans left Earth's orbit.

During his presidency, Johnson faced a major conflict: the Vietnam War. Despite his efforts, he couldn't achieve a peaceful resolution, which led to numerous protests and controversy in the U.S.

On January 22, 1973, Johnson passed away at the age of 64 from a heart attack.