Why did native american economic systems weaken in the late nineteenth century?

Many nineteenth-century Indians faced an erosion of their economies in the face of American expansion. Removal from their lands or a corrosive reliance on the Anglo-dominated market (or both) was a common outcome. The natives of the Eastern seaboard had faced these problems in the colonial period.

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the founding fathers did not think women were asmportant as mern were and men could do more and better things then women