WASHINGTON — The U.S. trade deficit rose in March for the first time since last July as the global recession cut sharply into sales of American exports. The politically sensitive deficit with China increased. The Commerce Department said Tuesday the deficit widened to $27.6 billion in March, slightly lower than the $29 billion gap that economists had forecast. The March deficit was 5.5 percent higher than February's revised $26.1 billion trade gap, which had been the smallest since November 1999.