WASHINGTON, July 29–The U.S. economy expanded at a 6.5% annualized rate in the second quarter of 2021, pushing overall gross domestic product above pre-pandemic levels. Investment in nonresidential structures, however, declined 7% for the quarter and has now contracted in six of the past seven quarters, according to an analysis by Associated Builders and Contractors of data released today by the U.S. Bureau of Economic Analysis.