Nuclear arms race was a key factor in extending the time period of the cold war. The seeds of the hostility between USSR in US began after the end of World War I with the rising of communism in USSR in Stalin rule made it worse.
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 />