<P> While it was the third - largest retailer in the United States, Walmart was more profitable than rivals Kmart and Sears by the late 1980s . By 1990, it became the largest U.S. retailer by revenue . </P> <P> Prior to the summer of 1990, Walmart had no presence on the West Coast or in the Northeast (except for a single Sam's Club in New Jersey which opened in November 1989), but in July and October that year, it opened its first stores in California and Pennsylvania, respectively . By the mid-1990s, it was far and away the most powerful retailer in the U.S. and expanded into Mexico in 1991 and Canada in 1994 . Walmart stores opened throughout the rest of the U.S., with Vermont being the last state to get a store in 1995 . </P> <P> Walmart stopped selling handguns in 1993 . </P> <P> The company also opened stores outside North America, entering South America in 1995 with stores in Argentina and Brazil; and Europe in July 1999, buying Asda in the United Kingdom for US $10 billion . </P>

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