Mexico's President Felipe Calderon is vowing to fight to the last day of his term against the drug cartels that have spread insecurity and taken over towns and police forces across Mexico. In a speech to the nation on Friday, President Felipe Calderon said if the Government backed down from its military crackdown, the country would be totally dominated by the drug gangs.He said the current strategy was the only way to end this cancer of drug trafficking and the ensuing violence. It is estimated that more than 41,000 people have been killed since Mr. Calderon launched his hardline offensive against drug cartels after taking office nearly five years ago. Last week, 52 people were killed in one of the worst single attack against civilians when gunmen set fire to a casino in the northern city of Monterrey.