The battle of 1812 was the war of 1812
Filmmakers most likely chose this name because it was about the Selma to Montgomery marches that Dr. King participated in. The name is Selma and not Dr. King because it is a story told over a three month period where Dr. King and many others planned the Selma marches.
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Activists held racial and religious prejudices against immigrants from Asia and southern and eastern Europe in particular. Feared that immigrants that worked for lower wages would take jobs away from union members. To plot against them, activists created the Chinese Exclusion Act and formed the Immigration Restriction League.