The reason the US got involved during WWII was Japan bombing Pearl Habor, therefore United States declaring war against Japan
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The answer is: Southern Democrats
After the election of Abraham Lincoln, Southern Democrats led the charge to secede from the Union and form the Confederate States of America. The Union Congress was dominated by Republicans, save for Andrew Johnson of Tennessee, the only senator from a state in rebellion to reject secession.
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C would be the correct answer considering most accurate out of all technology and growth that was produced there