What led to Tijerina's imprisonment?

The correct choice highlights Tijerina's direct actions related to land grants in New Mexico, which were a significant aspect of his activism. Reies López Tijerina was a prominent figure in the Chicano civil rights movement, particularly known for advocating the restoration of land grants to Native American and Hispanic descendants in the Southwest, areas that had historically been taken over. His approach included more radical tactics, such as raids, particularly in the 1960s, when he led a raid on a courthouse to reclaim what he and his supporters believed were their rightful lands.

This strategy of taking direct action rather than engaging solely in dialogue or negotiating peacefully ultimately led to his arrest and imprisonment. His attempts to draw attention to the injustices faced by his community through these more militant actions were the root cause of his legal troubles, showcasing the intensity of his commitment to land rights and social justice for the disenfranchised populations in New Mexico.