The Treaty of Guadalupe Hidalgo, signed in 1848, concluded the Mexican-American War and included several key provisions.
Among the options you provided:
B: The U.S. paid Mexico $15 million is a correct statement. The treaty included financial compensation from the U.S. to Mexico for the territories acquired.
C: Rio Grande would be Mexico’s is incorrect. The treaty established the Rio Grande as the boundary between Texas and Mexico, which means it recognized the Rio Grande as the border of the United States, not Mexico.
D: Slavery was banned in California is not explicitly stated in the Treaty of Guadalupe Hidalgo. However, California was admitted to the Union as a free state in 1850, after the treaty.
Thus, B is the correct answer regarding what was part of the Treaty of Guadalupe Hidalgo.