Test time!
Who broke the color line for the last all white pre-expansion team in major league ball, and when did he do it?
Just to make a passing nod to the original focus of this thread, this event did not occur in February, and not on the 15th -- Ides or not.
The Boston Red Sox were the last major league team to integrate, due to the resistance of owner Tom Yawkey.
When integration did come, new General Manager Bucky Harris promoted Pumpsie Green from Boston's AAA farm club in July 1959, but Green did not become a regular player. Earl Wilson began as a regular in the Red Sox' rotation beginning 1962.
this, also, was the team that gave away george herman ruth, jr.