Explanation:
Emmett Till's murder was a spark in the upsurge of activism and resistance that became known as the Civil Rights movement.
D Although the U.S. had ramped up its industry during the first world war, it still did not have its full industrial capacity maximized until 1942 during world war 2. It was not "the" world leader in industry, however it was on the top of the list
As far as I know I'm pretty sure they weren't free due to the laws around the time period
