Answer
The Bucareli Treaty, signed in 1923, granted U.S. diplomatic recognition to Álvaro Obregón's government in Mexico. This marked a significant shift in U.S.-Mexican relations, as the U.S. had previously refused to recognize Obregón's presidency due to concerns over his revolutionary policies and the country's political instability. The treaty helped normalize relations between the two countries and paved the way for increased cooperation and trade.