The Tohono O’odham Nation has warned that federal border-wall contractors may attempt to enter its reservation without authorization, prompting “No Trespassing” signs across Nation lands and putting Tribal police on alert. The dispute is rooted in a border drawn through an existing Indigenous homeland. The international boundary cuts through a wider O’odham homeland spanning present-day Arizona and Sonora, Mexico. Distinct O’odham peoples, including Tohono O’odham and Hia-Ced O’odham, have longstanding ties to lands across this region, and O’odham communities continue to live on both sides of the border today. In its federal lawsuit, the Nation says the border has long divided O’odham communities and families. It also says an agreement with Border Patrol allows Tribal members from either side to cross through three traditional gates, with additional crossings coordinated for ceremonies, gathering and other cultural purposes. Vice Chairwoman Carla Johnson said a permanent wall would...