Final answer:
The Antiquities Act of 1906 and the National Historical Act of 1966 did not directly address the concerns of Native Americans regarding their ancestors and gravesites. The Native American Graves Protection and Repatriation Act of 1990 specifically addressed these concerns by requiring the return of cultural items to Native American tribes.
Step-by-step explanation:
False. The Antiquities Act of 1906 and the National Historical Act of 1966 did not directly address the concerns of Native Americans regarding their ancestors and gravesites. However, the Native American Graves Protection and Repatriation Act (NAGPRA) of 1990 specifically addressed these concerns by requiring the return of human remains, funerary objects, and other cultural items to Native American tribes and organizations when there is a demonstrated cultural affiliation. NAGPRA provided tribes with the ability to repatriate objects that were previously removed from their ancestral lands through research and excavation.