Answer:
Mainly Trench Warfare was popularized by the use of new mechanized weapons such as Artillery, and also because of the mass victories in the east on germany's side, Russia used these as a form of slowing them down and to protect their troops, but often these trenches hurt these men by disease, starvation, etc.
Answer: The time period is 1300-1600
To stop the spread of communist after World War II, the United States established a policy known as the Truman Doctrine.
