nobody knows how or what created it.sorry if this didn't answer your question.
The underlying cause was German expansionism.
Since the whole world was in depression the war created jobs for people to manufacture goods,
France
France
Saar was the new state that was created between France and Germany in World War 1.
in what later became the country of lebanin
what was the aftermath in econemy and censes created by world war 1
Austria and Hungary
Germany was created after the world war 1 when they had to rebuild they named it Germany .
The league of nations was created after World War 1 at the behest of U.S. President Woodrow Wilson
The League of Nations
the league of nations
The treaty of Versaille