The Corp did not discover a northwest passage but what instead?

On November 15, 1805, Lewis and Clark and the Corps of Volunteers for Northwestern Discovery reach the Pacific Ocean at the mouth of the Columbia River, one year, six months, and one day after leaving St. Louis, Missouri, in search of the legendary "Northwest Passage" to the sea.

Hudson and his crew sailed around Long Island and into New York's Hudson River, but turned back when they realized it was not a through-channel. While Hudson didn't discover the Northwest Passage, his voyage was the first step toward Dutch colonization of New York and the Hudson River area.