Germany, England, and France. As each nation is a member of NATO (North Atlantic Treaty Organization), the US has promised to deliver military aid if they have been invaded or attacked by another nation. So, the United States would send extra troops overseas to assist current groups stationed in Europe. In times of peace, it is most typically economically, but sometimes, US presence in times of increasing hostility is enough to cause the aforementioned hostilities to cease. In both times of war and peace, these nations should assist in the same way as the United States does.
The Federal Deposit Insurance Corporation (FDIC) was created in in 1933 and it was to protect bank depositors and ensure a level of trust in the American banking system, during the Great Depression.
The Exchange Commission (SEC) was created in 1934 and the goal was to to help investors feel comfortable to put money back into the stock market.
Both were important to create confidence in american people, and to create the possibility to get out of the Great Depression.
I've heard this around before, apparently scientists can create plasma made from equal amounts of matter and antimatter, so yes.