The city will require businesses seeking to take advantage of millions of dollars in tax incentives and grants following Hurricane Katrina to use as many local and minority-owned firms as possible, Mayor Ray Nagin announced Monday. Nagin signed an executive order requiring large businesses seeking tax breaks and other incentives to use 50 percent local businesses and 35 percent women- or minority-controlled businesses whenever possible. Similar requirements have been in place for government contracts, but the order expands the requirement to businesses asking for assistance promised by various federal hurricane recovery programs. "We just want to make sure we don't...