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.[25] Walmart stores opened throughout the rest of the U.S., with Vermont being the last state to get a store in 1995.[26]