U.S. President Donald Trump's lowered 15 percent tariff on automobiles from Japan took effect Tuesday about five months after his aggressive trade approach began to take a toll on the industrial backbone of one of Washington's key allies.After Trump imposed an additional auto tariff on national security grounds in April, the U.S. tariff rate for foreign-origin cars rose from 2.5 percent to 27.5 percent, squeezing the margins of Japanese automakers and other manufacturers.The reduced tariff is part of a trade deal the Trump administration struck on July 22 with Japan, which in return has com…READ FULL ARTICLE