In 1917, Germany attacked some passengers in submarines from the US that led the US to assist in WW1. Hope this helps!
Answer:
wellHistorians have identified several causes that led to the outbreak of the Cold War, including: tensions between the two nations at the end of World War II, the ideological conflict between both the United States and the Soviet Union, the emergence of nuclear weapons, and the fear of communism in the United States.
Explanation:
Prior to the Qing Dynasty, China had resisted foreign influence because they "were geographically too hard to reach" since many mountain regions provided protection.