User blog comment:Kabutsu/Assassin's Creed IV Setting Ideas/@comment-4955250-20121121103638

Reconstruction era America (post civil war), resurgence of manifest destiny ideals and further expansion westward (possible unknown precursor sites in the desert) , building of the Transcontinental railroad mostly by Chinese slaves ( runaway slave Assassin, use of kung-fu), rise of the KKK (possible extremist splinter organization or Templar controlled fear agents) changing laws for the recently emancipated, plus other cool little things like twin hidden Derringer's, boot knives (think hidden blades in a boots sole for brutal kicks), and the most multi-cultural cast you could possibly have (Irish, German and Dutch immigrants, recently freed black slaves, indentured chinese, native american indians, mexicans, etc. And all types of faiths as well) making the brotherhood and multiplayer characters even more unique  than before. Also Connor's legacy could live on in the fact that he is quite revered amongst the American Assassin branch and quite possibly the author of his own Codex.

I haven't played all the games so perhaps some of these ideas clash with the canon of the series. Please let me know if they do or if anything sounds stupid to you.