A security guard keeps watch in front of the local offices of Daimler-Chrysler, inside an office park containing several American companies, in Guaynabo, Puerto Rico, Tuesday, March 20. The 108-year-old push to make Puerto Rico the 51st state is thriving on the Caribbean island, but powerful U.S. business interests continue to trump local politics, making it less likely than ever, some experts say. (AP Photo/Brennan Linsley) Brennan Linsley