What are the three benefits the east coast to west coast promises?

There have been some economic benefits from Confederation. ... Similarities between West Coast and East Coast development are striking. ... reached the mouth of the Fraser River in 1808, three years after the United States Lewis ... Still further pressure from the Colonial Office, and Canada's promise of transcontinental ...

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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.