Explanation:
The most important role of a government is to provide aid to vulnerable citizens
Assuming you're referring to World War I, the main event that moved the United States from neutrality to war was the sinking of the Lusitania, since many Americans died, and it was the Germans who were responsible.
I think the constitution prohibits the enactment of ex post facto.
B Maine was admitted as a free state and slavery was prohibited North of latitude 36°30