In addition to official restriction white southerners blocked Africa American from voting by

In addition to official restrictions, white Southerners blocked African Americans from voting by offering to end segregation. using violence and threats. secretly changing election dates. bribing them to stay away from polls.

Threatening voters, physically removing them from the polls, and stuffing ballot boxes.

Explanation:

Some other "unofficial" restrictions included poll taxes, literacy tests, and the grandfather clause. But since this question was vague, I assumed you meant the things that weren't put into law

stone age, iron age, olden days, prehistory

explanation:

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in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.