Conversation so far:
Who was Gerald Ford?
Gerald Ford was an American politician who served as the 38th president of the United States from August 1974 to January 1977.
What happened to Gerald Ford  in 1973?
On December 6, 1973, Gerald Ford took the oath of office as Vice President of the United States.
Are there any other interesting aspects about the Gerald Ford article?
Gerald Ford became Vice President as the Watergate scandal was unfolding.

Question: When did he become vice president
Self-contained rewrite: When did Gerald Ford become vice president of the United States?