They welcomed the Americans and fought alongside them.
Answer:
USSR, Poland, East Germany, Albania (until 1968), Bulgaria, Czechoslovakia, Hungary and Romania.
Explanation:
A. a disagreement between the states over representation in Congress
The Zimmerman note was a secret note sent on January 16th, 1917 by German Arthur Zimmerman to count Johann von Bernstorff. In the note it said that Mexico should be asked to enter the war as a German ally