(By Franco Ordoñez, fordonez@charlotteobserver.com) Four immigration enforcement bills gaining momentum in the N.C. General Assembly would, if passed, make North Carolina an even tougher place for illegal immigrants to reside.One bill prevents foreign-born residents from using their home country's IDs as legal identification. A second requires all businesses with at least 25 employees to check the legal status of new hires using a federal system called E-Verify.