Citation:
The '54-40 or fight' slogan was a rallying cry during the mid-19th century advocating for the United States to assert its claim over the entire Oregon Territory up to latitude 54°40′ north. This slogan reflected the intense nationalism and expansionist sentiment of the period, particularly as it related to U.S. interests in the Pacific Northwest and interactions with Britain, which also claimed parts of the territory. The phrase became a significant symbol of Manifest Destiny, expressing the belief that Americans were destined to expand across the continent.