Answer:
A "Red Scare" is the promotion of a widespread fear of a potential rise of communism or anarchism by a society or state. The name refers to the red flags that the communists used. The term is most often used to refer to two periods in the history of the United States which are referred to by this name.
Explanation: This is why the government was so scared.
Answer: It decreased its territory by half
Explanation: Mexico had lost Texas, California, Nevada, Arizona and parts of other present-day American states.
Answer:
I think its C sorry if its wrong.
Answer: this is not really so therfor nothing would happen
Explanation:
Early civilizations depended greatly on agriculture, which means that they depended on water.
What Mesopotamians and Egyptians did (as well as others) was that they built canals from the rivers which would lead water to the crops as an irrigation system more or less.
Answer:

Hope it helped,
BioTeacher101