Where and which states in the United States use Spanish more often?

Only the southern United States speaks Spanish, and the Spanish spoken in Mexico is castellano. Spanish is spoken in Latin America except Brazil, Suriname, French Guiana and Haiti. But they speak in different ways, just like China dialect. Although the main language room in Brazil is Portuguese, Spanish is listed as compulsory education. There is also a Spanish-speaking place called Equatorial Guinea, where people are as black as black pearls ~