Historically, struggles between American Indian tribes and the federal government have stemmed from: a the Constitution's failure to precisely define the relationship between American Indian tribes and the national government. b the inability of nativists to bring the necessary reforms to both the federal government and tribal leaders. c Supreme Court decisions which blocked meaningful legislation for American Indians. d federal actions stripping away rights granted to American Indians by the 14th Amendment.

a. the Constitution's failure to precisely define the relationship between American Indian tribes and the national government.

Explanation:

The Constitution is a bit vague when it comes to defining the relationship the Federal Government should have with the American Indian Tribes.

This has allowed for the Federal Government to take advantage of loopholes and historically, treat the American Indian tribes unfairly.

Some speculate that the Constitution was deliberately left that way so that such loopholes could be taken advantage of.

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