American public opinion of the war begins to change. More citizens want U.S. involvement in WWI.

Identify the subsequent effect of this event:

a) The United States declares war on Germany.
b) The United States withdraws from diplomatic negotiations.
c) The United States joins the League of Nations.
d) The United States imposes economic sanctions on Germany.
e) The United States reduces military spending.
f) The United States signs a peace treaty with Germany.