But as gold was discovered in California, the U.S. The Treaty of Temecula would have given tribes about 12,000 square miles of Southern California. Finally, 30 years after the conclusion of the Treaty at the Village of Temecula, the promise of permanent lands for the Pechanga People was fulfilled. The Pechanga People have lived in the Temecula Valley since time immemorial. Arthur issued an Executive Order re-establishing the government-to-government relationship between Pechanga and the United States and setting aside a mere 4,000 acres for the Pechanga Indian Reservation. 1882 was one of the most important years ever in the history of the Pechanga Band of Luiseño Indians.