b) He coined the phrase “Go West, young man”

Journalist Horace Greeley made a significant contribution to the era of Westward Expansion with his famous phrase, “Go West, young man.” This phrase, popularized in the 19th century, captured the spirit of American expansionism and the belief in Manifest Destiny. Greeley, a prominent newspaper editor, used his platform to encourage American settlement in the West, advocating for the opportunities and potential prosperity that awaited. His words became a rallying cry for generations of Americans, embodying the optimism and adventurous spirit that drove the expansion of the United States across the continent.