Depends what your researching
Answer: It actually is Poland, when Poland was invaded Britain declared war. Germany's mistake in the war was when they invaded Russia.
Explanation:
Representation of people
Limited government
Religious toleration
Do Cold war, World War 2, Napoleon, etc. I feel like these are much easier topics
Germany was no valid threat to the Unites States, and he looked back at the first World War and he wanted a legitimate reason to declare war. That happens when Japan bombed Pearl Harbor in December of 1941