The northern parts are actually very arid and dry
The Maya civilization occupied a wide territory that included southeastern Mexico and northern Central America. This area included the entire Yucatán Peninsula and all of the territory now incorporated into the modern countries of Guatemala and Belize, as well as the western portions of Honduras and El Salvador.
Because popular sovereignty was well supported because it allowed the local citizens of a territory to decide if slavery was to be allowed or illegal. Stephen A. Douglas pushed for popular sovereignty during the 1840's.
Hope this helps :)
The main purpose of the National Association for the Advancement of Colored People is to make sure that the rights of colored people will be provided - whether it's educational, economic, political and social. This is all for the sake eliminating racial discrimination.