Answer:
Franklin D. Roosevelt the president at the time asked Congress to declare war on Japan and they did by an anonymous vote. After the war on Japan the United States became fully part of the Second World War.
Explanation:
I hope this helped :)
I think the word you are looking for is Militarianism.
Answer: Powder Keg of Europe.
Explanation: This is due to numerous nationalistic movements against colonial powers, Austria-Hungary and the Ottoman Empire.
It started in 18th century
It's definitely A as one answer, but I'm unsure about the other answer. But I can almost 100% say that C is most likely the second answer. I hope I helped in some ways!