Why did they pass the native american graves protection and repatriation act?

To return ancient American Indian human remains and artifacts to tribes.

Explanation:

The Native American Graves Protection and Repatriation Act was a law that was passed in the United States in 1990. The Act required federal agencies to return cultural items, human remains and artifacts to Indian tribes. This includes items such as funerary objects and objects of cultural patrimony. The passage of the act was a significant step towards the protection of Native American culture and rights.

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