Who was the Republican vice president under Dwight D. Eisenhower?

The correct answer is that Richard Nixon served as the Republican vice president under Dwight D. Eisenhower. Nixon held the office from 1953 to 1961, during Eisenhower's two terms as president. His role as vice president was significant, as he was involved in both domestic policy and foreign affairs, helping to shape the administration's approach during a pivotal time in American history marked by the Cold War and the civil rights movement.

Lyndon B. Johnson served as vice president under John F. Kennedy, while Harry Truman was vice president under Franklin D. Roosevelt before becoming president himself. Gerald Ford became vice president later, serving under Richard Nixon after Spiro Agnew's resignation, and eventually assumed the presidency. Each of these individuals held important political positions, but Nixon's direct association as vice president under Eisenhower distinguishes him as the correct answer in this context.