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why did the u. s. enter world war ii?

european allies were losing the war.

germany threatened america.

the u. s. was attacked on its home soil.

america’s economy was suffering.

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth