American Motors Corporation (AMC; commonly referred to as American Motors) was an American automobile manufacturing company formed by the merger of Nash-Kelvinator Corporation and Hudson Motor Car Company on May 1, 1954. At the time, it was the largest corporate merger in U.S. history. American Motors's most-similar competitors were those automakers who held similar annual sales such as Studebaker, Packard, Kaiser Motors, and Willys-Overland. Their largest competitors were the Big Three — Ford, General Motors, and Chrysler.