MADRID (AFP) - Spain's prime minister delivered his final state of the nation address on Tuesday, vowing to crack down on debt and battle an economic crisis that has unleashed mass protests. Prime Minister Jose Luis Rodriguez Zapatero, who will not stand in general elections due in March 2012, said he would curb spending by powerful regions, whose debts are a major concern on financial markets. Madrid will propose a cap on regional budgets next month, so as to "guarantee fiscal sustainability in the mid term," the prime minister told parliament.