Christopher Columbus never did land in what is currently classified as the United States. In fact, reasonable arguments can be made that, despite being credited with its discovery, Christopher Columbus never set foot on anything currently called "America" until his third voyage and by that time had already been beaten to mainland discovery by other adventurers.
During his first voyage in 1492, Columbus reached an island he would call San Salvador, what is now known as the Bahamas. On this first voyage he also reached Cuba, Hispaniola, and Haiti but never came close to the mainland continent. In subsequent voyages, Columbus would only reach the mainland twice: once on his third voyage when he reached the Paria Peninsula in 1498 and once on his fourth voyage when he reached Honduras and hug along the Central American coastline sailing by Nicaragua, Costa Rica, and stopping briefly in Panama.