All of these answers could be true, I know for a fact that A is true, could you give more context?
The Missouri Compromise (1820) - Missouri's Southern border to be taken as the line of latitude extending West as the frontier of slavery.
The Berlin Airlift was one of the defining events of the Cold War. American and British cargo planes delivered over 2.3 million tons of supplies to the citizens of Berlin during a Soviet blockade of the city from June 1948 to May 1949.
The practice of enslaving people is contrary to Christian principles
