After the fall of Memphis and New Orleans in 1862 Vicksburg
Mississippi remained a transit point for Confederate supplies
across the Mississippi River. The high bluffs which the town sits
on are a singular feature of the Mississippi Delta region and made
the city a natural fortress for the Confederacy. Control of the
town and the bluffs meant control of the Mississippi river and all
the commerce and communications that went with it. Therefore the
town became the most important strategic objective of the Union
Army in the West from December 1862 until the town surrendered on
July 4 1863,
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Most of just the common average citizens. You see, after WW1, reparations were high in Germany. Inflation rose and people were getting desperate for food and work. When the great depression hit, it hit Germany the hardest. The average German person was driven towards Hitler and the nazi party as Hitler said the Germans were not to blame and that he would fix all of their problems.
for proving that planets move in elliptical orbits
It was the anti-westward movment forbidding all settlers to cross the appalachian mountains.