 Complete the following phrase:  The sense of Chicano nationalism was enhanced by a geographical proximity of the United States and Mexico. Chicanos use the name Aztlán in reference to territories within the boundaries of the Mexican Cession, the land that was granted to Spain in 1493 by Pope Alexander VI in Bull Inter caetera, then claimed by the First Mexican Empire in 1821 when Spain signed the Treaty of Córdoba at the conclusion of the 