There were several countries that did not participate in World War I. The primary neutral countries during World War I were Argentina, Chile, The Netherlands, Spain, Denmark, Norway, Venezuela, Sweden, Belgium, and Switzerland.
The United States was one of many nations that were not combatants at the beginning of World War 1.
no they were not
United States.!
Austria Hungary did not become one nation after World War 1.
the us marines poster
U.s.a
Probably due to the increased mechanization of the combatant forces. But frankly, the production of national industries was a key factor in many conflicts prior to the first world war.
germany
Germany did by attacking France.
United States
united states
Russia