The US economy started booming in the 1920s because WWI was just ended/coming to a close and all of the money that was spent on war supplies made companies and workers richer as well the war debt and damage of our alies needing supplies that we gave giving us even more money and prosperity.
Since you're in a rush, the shortest answer would be that it is D., William Seward, whom decided to buy Alaska.
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little late but here... independents, independents, democrats.
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got it on e2020
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The Mexican Revolution sparked the Constitution of 1917 which provided for the separation of Church and state, government ownership of the subsoil, holding of land by communal groups, the right of labor to organize and strike, and many other aspirations. Hope this helps