Answer:
the red scare was a mass hysteria when people felt threatened by communism due to the cold War between the Soviet Union and the U.S. the first red scare was in the 1920s because of the Russian revolution that had just happened and the citizens of the U.S were scared that their country would too turn to a communist government.
I think it is the third one hope that helps
It was Political upheaval
He miscalculated the size of the Earth by more than half.
You didn’t include a pic for your question
