The reason why the area of the City of New Orleans which is in the Delta of Great River were not flooded is because these areas are geographically covered by natural leeves of the river, these leeves are higher in elevation compared as compared to the adjacent areas, thus the flood water wouldn't have reached these high points.<span />
Because Austria's army in 1788 was not one single and unified fighting force. Rather, Austria's army (Which at the time was not called Austria but the Habsburg Empire) was composed of squads from many smaller nations that were found in the Habsburg Empire. Because there were strong nationalist tendencies among these, they spoke differently and this eventually lead to big differences among different groups and attacks between each other.
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The main impact of the invention of the cotton gin in 1793 was on the ability to process short-staple cotton.