Here are the answers to your questions based on the historical context provided:
**Question 1:** The main idea that contributed to Congress passing the Neutrality Acts in 1935, 1937, and 1939 is:
- **Most Americans didn't want to get involved in European affairs.**
**Question 2:** The principles of fascism can best be described as:
- **A dictatorship that promotes nationalism through military force.**
**Question 3:** In defeating Japan in World War 2, the United States used all of the following EXCEPT:
- **A mainland invasion of Japan.**
**Question 4:** The reason the Yalta Conference is considered the beginning of the Cold War is:
- **Joseph Stalin expanded communist control over East Europe.**
**Question 5:** With reference to World War 2, the term Holocaust refers to:
- **Hitler's campaign to exterminate the Jewish people.**
**Question 6:** The Western Allies responded to Germany's invasion of Russia by:
- **They sent supplies and intelligence information to the USSR (Russia).**
**Question 7:** The Manhattan Project's purpose was to:
- **develop the atomic bomb.**
**Question 8:** World War 2 started when Germany invaded which country:
- **Poland.**
**Question 9:** The key to US success at the Battle of Midway was:
- **Having cracked the main Japanese naval communications code.**
**Question 10:** The most important source of Soviet resentment about Allied conduct of World War 2 was:
- **the slowness of the Allies in opening a major second front.**
**Question 11:** The impact the Smoot-Hawley Tariff had on the Great Depression was:
- **Countries responded by raising tariffs on American goods, further hurting the American economy.**