NEW YORK (Reuters) – Regional economic reports on Monday suggested the U.S. economy has clambered back to levels associated with the end of recession, but recovery will be patchy and may prove fleeting. Economic activity and manufacturing data for the U.S. Mid West and Texas hinted the impact of the global financial crisis is slowly abating as the economy emerges from the longest recession in 70 years. However, an index of national economic activity slipped on a monthly basis and a Texas manufacturing output index fell. ... The indices preceded gross domestic product results on Thursday, the broadest measure of...