Congress's attempt to "americanize" indians with the dawes act failed because

Congress' attempt to "americanize" indians with the Dawes act failed because it met strong Native American resistance, and much of the land set aside for the Natives was uninhabitable.

answer; /// slavery should be outlawed in the new country, was part of the initial draft of the declaration of independence, but not part of the final

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.