Answer:
The passage of the Civil Rights Act of 1964 was a significant event in converting the Deep South to the Republican Party; in that year most Senatorial Republicans supported the Act (most of the opposition came from Southern Democrats)
The first use of the 25th Amendment occurred in 1973 when President Richard Nixon nominated Congressman Gerald R. Ford of Michigan to fill the vacancy left by Vice President Spiro Agne
The name of that pact was Ribbentrop-Molotov Pact: the pact of non-agression between Germany and Soviet Union (that also secretly involved splitting Europe among them).
