Following the assassination of President James A. Garfield by a disgruntled job seeker, Congress passed the Pendleton Act in January of 1883. The Pendleton Act provided that Federal Government jobs be awarded on the basis of merit and that Government employees be selected through competitive exams.
The correct answer is B) emergence of a written language
Unlike the other mentioned things, emergence of a written language did revolutionize Native American cultures. Everything else mentioned here was just there and completely normal as they were hunters and what not.
The answer to this is African Americans.
Back around World War II they mostly pay attention to the war so the whole racism left African Americans alone because around that time they didn't quite care for that too much because they mostly want to keep on the whole war thing. Around that time the U.S was just about getting ready to get involved.
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