The war also bankrupted most of the combatant powers .

It also marked Recording the U.S. Navy 's first exchange of anti-ship missiles with opposing ships and the only occasion since World War II on which the US Navy sank a major surface combatant .

However , with the entrance of the United States into the war in December 1941 , Greenland became Becoming a combatant .

Austria-Hungary , although not a combatant , became Becoming relatively weaker as a much enlarged Expansion Serbia pushed Motion for union of the South Slavic peoples .

Prior to March 2009 , the main combatant group against the FARDC was the National Congress for the Defence Defending of the People ( CNDP ) .