With 48 slain in first 6 months of 2010, 2009 toll of 80 may be exceededForty-eight Americans were killed in Mexico during the first six months of 2010 — a deadly pace that appears likely to exceed any previous year of homicides on record, according to the Houston Chronicle's analysis of the U.S. State Department's death registry. The tally doesn't include two Texans reported killed Sept. 30 in separate incidents in isolated areas of Tamaulipas, where the terrorist group known as the Zetas has been warring with their Gulf Cartel rivals in communities all along the Southeast Texas border. A...