Germany fought Russia/USSR and France in both world wars. Both Italy and Japan where aligned with Third Reich in WW2, but fought against Germany in WW1. Italy did align itself with the German Empire in the years leading up to WW1, so that is the best answer out of all of these. However none of them are truly correct.
The transportation revolution pertains to trains and the transcontinental railroad. This was made possible with the mass production of steel on the East Coast. Which is the industrial revolution. Simply put, without the industrial revolution the transportation revolution never would have happened and the United States wouldn't have developed the west like it did.
Louisiana purchase is the answer to your question.
The correct answer is the internment of Japanese-American citizens.
The United States government decided that Japanese-American citizens were a security threat and they put them into internment camps.
