Then why haven't they done so in Mexico; it seems ripe for it...
< /devil's advocate >
Becausein Mexico the Mexican Army is not for defense but for internal control.
Who has all the guns in mexico? You guessed it the people behind the walls and the drug barons.Not much chance of an uprising there.
THE POPULATION OF MEXICO IS LIVING IN A WESTERN HEMISPHERIC VERSION OF THE IRON CURTAIN. GOING BACK TO MEXICO AND STARTING A REVOLUTION TO CHANGE THEIR COUNTRY IS NOT AN OPTION FOR THE AVERAGE MEXICAN. THAT IS WHY THEY COME HERE WHERE THEY CAN GET HEALTH CARE FOR FREE, FIND WORK WITHOUT PAYING TAXES AND THEN COMPLAIN ABOUT HOW TOUGH THEIR LIFE IS IN AMERICA. THEY KNOW THAT EMPTY HEADED AMERICANS WILL BUY INTO THAT LINE.
THEY ALSO KNOW THAT THERE ARE THOSE IN THE UNITED STATES WHO HATE AMERICA SO MUCH THEY WOULD JUST AS SOON HAVE OUR COUNTRY INVADED BY ANOTHER 50 MILLION ILLEGALS BY THE NEXT CENSUS.