Nation shall be given equal opportunity to participate in the economic resources and activities of the Tohono O'odham Nation." However, many tribal members felt that these promises were not guaranteed for them. At the end of the decade, O'odham on the Mexican side of the border wrote an "open letter" to O'odham on the American side. In the letter they stated: "our human rights and aboriginal rights have slowly been violated or disappeared in Mexico." This articulated the concerns among many Oʼodham about the growing international divide and population loss in Sonora. In its 1990 census, the government of Mexico recorded no Oʼodham living in Sonora. 2000–present The O'odham saw a subsequent rise in illegal crossing and smuggling through tribal lands as the surrounding security increased. In 2003 the Nation hosted a Congressional hearing on the illegal activity occurring on tribal lands. In the hearing tribal leaders and law enforcement officers testified of "incidents of cross-border violence, and even incursions by Mexican military personnel in support of drug smugglers." Along with the cross-border violence, tribal members continued to experience other social and legal consequences from the border. Tribal members born in Mexico or who have insufficient documentation to prove U.S. birth or residency, found themselves trapped in a remote corner of Mexico, with no access to the tribal centers only tens of miles away. In 2001, a bill was proposed that would give citizenship to all Tohono Oʼodham, but the bill was forgotten in the aftermath of 9/11. Since then, bills have repeatedly been introduced in Congress to solve the "one people-two country" problem by granting U.S. citizenship to all enrolled members of the Tohono Oʼodham, but so far their sponsors have not gained passage. Opponents of granting U.S. citizenship to all enrolled members of the Nation include concerns that many births on the reservation have been informally recorded, and the records are susceptible to easy alteration or falsification. O'odham can cross the border with Tribal Identification Cards, but these can be denied at the border and legal documentation on the reservation is poor. Separation from family members and detainment are possibilities for O'odham crossing into the United States. Today, the tribal government incurs extra costs due to the proximity of the U.S.-Mexico border. There are also associated social problems. In an area of acute poverty offers from smugglers for Oʼodham to assist in illegal activity are common, and in