Because Slate was more common in wet microclimates.
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During 1931-1945(world war 2) japan became to build up and later went to war with the united states (August 1941 The Battle of Pearl Harbor)
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Lebensraum translates as 'Living room'.
It was the belief that Germany should conquer neighbouring countries in order to make room for their Aryan master race to thrive.
So I’m WW1 first it started out with two countries which would fight later on they get allies to fight with them