Yes, geographers do study the growth pattern of world population; its a branch of geography called demography
Around the country of Mexico because the tropics are usually hot so that is why the Mexicans are usually have a darker skin colors than the Americans or the Canadians which are more north than Mexico and the closest to be around the hotter tempature Mexico is the southern American states. In example of are: southern California, Arizona, Texas, Louisiana( usually Cajun Country which is more humid and hotter during the summers), Mississippi, Alabama and Florida. Which these states are hot during the summers and it is that you don't like the heat it is not recommended to be in these states or Mexico.
Pay taxes, get a job to stimulate the economy, becoming part of ones community.
