Who was the US vice President 1957?

There was no U.S. Vice President in 1947. Harry S. Truman was Franklin D. Roosevelt's Vice President, and Truman took the office of the President when FDR died in 1945. That left the office of Vice President vacant until the election of 1948.
This can't be true. There is a protocol for appointing a vice president in every administration. Not sure of the method then. Roosevelt was only about a month or two into his 4th term, that means no VPfor 4 yrs? I don't think so!