Ared scare occurred at what earlier period in american history?
a. 1917 1920, after the russian revolution
b. 1865 1877, during reconstruction in the south
c. 1812, during the war of 1812
d. 1898, during the spanish-american war

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!

nuclear weapons are hoaxes. many people believe they are real, though.