两消息拖累美股，纳指跌超1%

Core Viewpoint - The U.S. stock market indices experienced declines, influenced by geopolitical tensions and strong economic data affecting interest rate expectations [1]. Group 1: Market Performance - The Nasdaq index initially dropped by 1.3%, the S&P 500 index fell nearly 1%, and the Dow Jones decreased by 0.5% [1]. - The latest values for the indices are: S&P 500 at 6582.50 (-0.84%), Nasdaq at 22230.00 (-1.19%), and Dow Jones at 45936.04 (-0.40%) [2]. Group 2: Geopolitical Concerns - The North American Aerospace Defense Command (NORAD) reported tracking Russian military aircraft in the Alaskan air defense identification zone, which prompted the U.S. military to deploy an E-3 AWACS, four F-16 fighters, and four KC-135 tankers for identification and interception [1]. - NORAD stated that such Russian activities are common and not considered a threat, although recent drone activity in Europe has heightened market concerns [1]. Group 3: Economic Data - The U.S. economy's second-quarter growth exceeded expectations, primarily driven by strong consumer spending and reduced imports, leading to a GDP revision up to 3.8%, marking the fastest growth rate in nearly two years [1].