The political boundaries of the U.S changed from 1845 to 1853 by increasing the territory and getting land as far out as California because the Americans fought the Mexican American war (1846-1848) that resulted in Mexico yielding the area we know as the Mexican cession have a nice day (:
The contributions of African Americans for the Union war effort in the Civil War pushed the federal government, controlled largely by the republican party, to exchange the course of action and affected the consequences which included but were not limited to the amendment of the constitution to give certain rights to african americans.
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Religious militancy exists in every type of religion. Almost always, those who practice this kind of radical militancy in the name of a particular religion represent only a small fraction of that religion's followers.