Destruction of everything in their path--The goal of the Atlanta Campaign was to destroy Southern morale and a few major cities effectively cutting the South in two.
The Atlanta Campaign attempted to destroy South Carolina, Savannah and Atlanta, GA. Doing this would ruin the morale of the South and take away valuable material and financial resources. The end goal would also cut the South in two ruining supply-lines.
1. (Religious answer) Because Abraham wouldn't worship false idols with his nephew, so he and his wife Sarah, left to settle in a different land which happened to be in the fertile crescent.
2. Because being close to the rivers and the floods made good farm land.
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The legislation authorized two railroad companies, the Union Pacific and the Central Pacific, to construct the lines.