Question

why have descendants of the estok gna had such a difficult time saving their sacred cultural sites and artifacts along the rio grande? (1 point)
their most sacred site is in mexico, where they have no authority to save it.
their most sacred site was submerged underwater after international falcon reservoir was constructed in the 1950s.
they have not been recognized as an indigenous group by the u.s. government.
they do not have leaders willing to challenge industrial and government projects that threaten their sacred sites.

Explanation:

The construction of the International Falcon Reservoir in the 1950s submerged the most sacred site of the Estok Gna descendants, making it difficult for them to save their sacred cultural sites and artifacts.

Answer:

Their most sacred site was submerged underwater after International Falcon Reservoir was constructed in the 1950s