Conversation so far:
What happened to Nolan Ryan in 1965?
In 1965, after graduating from Alvin High School, Ryan was drafted by the New York Mets.
What round was this in?
drafted by the New York Mets in the 12th round of the 1965 Major League Baseball draft.
What did he do?
He was assigned the minor league Marion Mets in the Appalachian League.
What did this lead too?
When Ryan was called up to the New York club the following year, he was the second-youngest player in the league.

Question: What did this mean?
Self-contained rewrite: What did getting called up to the New York Mets mean for Nolan Ryan?