The support trench served to house reinforcements, and supplies, for the front line troops that could be quickly transported to the front line trench. A third type of trench was commonly referred to as a reserve trench and was found dug "several hundred yards" behind the support and front line trenches.
Crop rotation had an impact on industrial revolution because it led to an increase in yield. The surplus production was able to sustain a large population that is necessary given the labor required in running industry. It also led to an enclosure in migration
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During the 1920s African American lives became better significantly better because their lives were changed socially and politically giving them more opportunities. (I hope this helps you :-} )
President Truman, along with many prominent politicians at the time, believed the United States should sign the treaty because he thought it would prevent another World War II, but most importantly the spread of communism.
