"Go West, Young Man, Go West" | Encyclopedia.com

On July 13, 1865, in an editorial, Horace Greeley, founder and editor of the New-York Tribune advised his readers to "Go west young man". It was a re-phrasing of an earlier editorial from 1851. From the article:

""GO WEST, YOUNG MAN, GO WEST"
"GO WEST, YOUNG MAN, GO WEST" was an expression first used by John Babsone Lane Soule in the Terre Haute Express in 1851. It appealed to Horace Greeley, who rephrased it slightly in an editorial in the New York Tribune on 13 July 1865: "Go West, young man, and grow up with the country." When the phrase gained popularity, Greeley printed Soule's article to show the source of his inspiration. The phrase captured the imaginations of clerks, mechanics, and soldiers returning from the Civil War, many of whom moved west to take up a homestead."