Brown on Friday signed tribal-state gambling compacts for the Enterprise Rancheria of Maidu Indians' proposed casino near the city of Marysville and the North Fork Rancheria's casino in the Central Valley city of Madera.
The compacts come after the U.S. Department of the Interior's approval in September 2011, which granted the tribes a rare exception to the federal law that prohibits gambling on reservations established after 1988.
The law allows the Interior Secretary to make an exception when the off-reservation facility is in the tribe's best interest.
Brown concurred with the federal government, saying the casinos were in the tribes' best interest.
The Associated Press contributed to this report.