I guess the purpose of the terracotta soldiers was to protect the emperor in his afterlife...
I believe it was a trial upon Ethel and Julius Rosenberg. The couple were accused of selling nuclear secrets to the Russians, but treason could not be held since the U.S was not at war with the Soviet Union.
A bill becomes law if signed by the President or if not signed within 10 days and Congress is in session. If Congress adjourns before the 10 days and the President has not signed the bill then it does not become law ("Pocket Veto.")
Similarities: the north Koreans and the Vietcong were communist, the Russians back both the north and south. Both are examples of the US following it's containment policy.
difference: Vietnam was dense jungle warfare.
Cotton gin was invented by Eli Whitney in 1793