Final answer:
Richard Nixon was the 37th president of the United States, inaugurated on January 20th, 1969. He succeeded Lyndon B. Johnson, who had followed John F. Kennedy and signed the Civil Rights Act of 1964 into law.
Step-by-step explanation:
The 37th president of the United States who was inaugurated on January 20th, 1969, was Richard Nixon. Before Nixon, Lyndon B. Johnson served as the 36th president following the assassination of John F. Kennedy, who was the 35th president and took his oath of office on January 20, 1961. The transition from Kennedy to Johnson highlighted a peaceful transfer of power despite the national trauma, and Johnson built upon Kennedy's legacy with significant domestic achievements, including the Civil Rights Act of 1964.