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alternatehistory.com
Some particulars: the course of US and world history is roughly the same, no additional states or new global orders or anything like that. Likewise the US is split by the Democrats and the Republicans who represent the same things they do in OTL.
Other then that world's your oyster! Maybe New Orleans became a boom city like Miami in the 20s? Maybe there was a large migration of African Americans there after the civil war? Or during the 60s as a kind of experiment in the civil rights era?