Did you know the answer

Bob had finally made it to the last round of the $1,000,000 Question
TV Quiz Show. The night before the big question, he told the host
that he desired a question on American History.

The big night arrived. Bob made his way on stage in front of the
studio and TV audience. He had become the talk of the town. He was
the best guest this show had ever seen. The host stepped up to the
microphone.

"Bob, you have chosen American History as your final question. You
know that if you correctly answer this question, you will walk away
one million dollars richer. Are you ready?"

Bob nodded with a cocky confidence -- the crowd went nuts. He hadn't
missed a question all week.

"Bob, yours is a two-part question. As you know, you may answer
either part first. As a rule, the second half of the question is
always easier. Which part would you like to take a stab at first?"

Bob was becoming more noticeably nervous. He couldn't believe it. He
was not sure, but American History was his best subject, so he played
it safe.

"I'll try the easier part first."

The host nodded approvingly. "Here we go, Bob. I will ask you the
second half first, then the first half."

The audience grew silent with anticipation.....

"Bob, here is your question: And in what year did it happen?"