Which countries' boundaries changed as a result of world war i or world war ii?

spain
soviet union
czechoslovakia
poland
germany
portugal
estonia
sweden

Soviet UnionCzechoslovakia Poland Germany  Estonia Sweden

Explanation:

The world war I has changed many boundaries if nations like the Poland Latvia that broke away from the Russian empire.  Czechoslovakia was formed from the former territories of the Austria and hungry. Germany was formed the federal republic in 1949 and with the weakening of the former USSR the other eastern European countries became independent.

Answer they are produced by collision of tectonic plates;

Answerkolkata;