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Super Mario Bros. 2 is a title that Nintendo used for two different games, one in Japan, and one in the United States. They were both considered sequels of the original Super Mario Bros. game in their respective territories.
The Japanese version of Super Mario Bros. 2 was released on the Japanese-only Famicom Disk System, and played very much like the original game with added elements and increased difficult. The game was deemed too difficult for the American audience and a non-Mario game, known in Japan as Doki Doki Panic, was altered and released in the States as Super Mario Bros. 2 instead.
Eventually both versions were released in both territories. The American version was released in Japan as Super Mario USA. The Japanese version was ultimately released in the U.S. when it was included in the Super Nintendo release of Super Mario All-Stars, under the title The Lost Levels.