US stock market today opened slightly lower as Dow, S&P 500, and Nasdaq futures paused after a powerful tech rally led by Nvidia, which just hit a historic $4 trillion market value. Meanwhile, President Trumps new tariff threats—including a proposed 50% import tax on Brazil and extra tariffs on BRICS nations—are now in focus.

President Trump will wield 50% copper tariffs on August 1 as he promises more to come with countries such as Brazil in the crosshairs. Delta’s good news, Nvidia scores the first $4 trillion market cap milestone,