HEL All of the following were reasons for the COLLAPSE of classical civilizations
(Rome, Greece, Persia, Han, Gupta) EXCEPT:
O Widespread disease due to long-distance trade networks.
O Increasing social inequality.
O Introduction of democracy in all of the above civilizations.
O Large geographic boundaries made it difficult to protect against outside invasions.

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Explanation:

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regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.