Most Americans supported isolationism. They didn't want to engage in another European war. Although this agreement didn't include sending troops to Europe, it involved sending 50 destroyers to UK, so the amount of help was rather major.
In the 1920s, many rural banks failed because banks had speculated in stocks. This in turn, led to failure of such banks and then soon after the Great Depression followed.
D) it protects our nation
A direct democracy it could also be B
