US stocks reached record highs on Tuesday despite President-elect Donald Trump's pledge to impose tariffs that could disrupt global trade. The S&P 500 rose more than half a percent, surpassing its previous high from November 11th. The Nasdaq Composite and Dow Jones Industrial also climbed. Stocks of companies like General Motors and Ford fell, affected by Trump's tariff threats on goods from Mexico. Investors are uncertain whether Trump's tariff threats are genuine or part of a negotiation strategy with other countries.