Great Wall of China – Qin Shihuang Di ordered the construction of the Great Wall of China to protect the The wall stretched miles and took years to build. fill in the blanks
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Great Wall of China -- Qin Shihuang Di ordered the construction of the Great Wall of China to protect the northern border from nomadic attacks. The wall stretched ~13171 miles and took ~20 years to build.

to keep attackers such as Mongolians out

21196km

20 years

(sorry if I'm wrong)

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.