The United States has been having trouble with its southern border due to the massive amount of illegal immigration from Mexico. What is the main reason for the Mexican immigration to the United States?

in an absolute  monarchy, the  monarchrules as an autocrat, with absolutepower  over the state and government — for example, the right to rule by decree, promulgate laws, and impose punishments. the  monarch isnominally sovereign but the electorate, through their legislature, exercise political sovereignty.

i think it is the third one.