I could tell you, if you told me the choices.
I believe that the answer is: The invasion of the Bay of Pigs.
Big business shaped the American economy in the late 1800s and early 1900s by outproducing smaller "family business," which drove prices down. This happened in large part due to the Industrial Revolution.
It was the movement of 6 million African Americans out of the rural southern states to the urban northeast, midwest,and west. This migration occurred because they wanted to escape the segregation, racism, and prejudice that was rampant in the southern states
Social Security, Medicaid, and Medicare