Trump's 10% baseline tariffs on imports from many countries now in effect

President Donald Trump's unilateral 10% tariff on all imports from many countries went into effect on Saturday, with U.S. customs agents beginning to collect.

The initial 10% "baseline" tariff took effect at U.S. seaports, airports and customs warehouses at 12:01 a.m. ET. Higher taxes on goods from 57 larger trading partners are set to start next week.

Trump's announcement of the tariff on Wednesday shook global stock markets, cutting $5 trillion in stock market value for S&P 500 companies by Friday's close...