标普500指数涨0.18%，道指持平，纳指涨0.2%。美国总统特朗普称，将发送将近200封关税信函。将利用关说收入作为对美国民众提供的返还。

Core Viewpoint - The S&P 500 index increased by 0.18%, the Dow Jones remained flat, and the Nasdaq rose by 0.2% [1] Group 1: Market Performance - The S&P 500 index saw a slight increase of 0.18% [1] - The Dow Jones Industrial Average remained unchanged [1] - The Nasdaq Composite experienced a rise of 0.2% [1] Group 2: Government Actions - President Trump announced plans to send nearly 200 tariff-related letters [1] - The administration intends to use revenue from tariffs as a means to provide returns to the American public [1]