In 2008, the U.S. economy was in turmoil, and yet investing great Warren Buffett wrote an op-ed column for The New York Times entitled: "Buy American. I Am." That was good advice.Consider that the S&P 500 -- an index of around 500 of the most important U.S. companies -- is up more than 500% since Buffett wrote his classic opinion piece.Now, in 2025, the U.S. economy is in turmoil again, but it's undeniably different this time, at least to a degree. President Donald Trump has quickly imposed and relaxed tari ...