Why was there a resurgence of the ku klux klan in the 1920's

The civil war and reconstruction had long lasting effects. it took awhile to sort everything out. there was also a burgeoning civl rights movement, and the kkk was attempting to stifle any chance at progress on the civil rights front 

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In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.