The phrase "fifty-four forty or fight!" referred to:

Question

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"Fifty-four forty or fight!" was a slogan used by US politicians and citizens in the 1840s to assert US territorial claims to the region now known as Oregon. The line of 54°40′ north latitude was seen as the desired northern boundary of US territory in that region. The dispute with Britain over this territory was resolved with the signing of the Oregon Treaty in 1846, which established the current border between the US and Canada.

The Phrase "Fifty-Four Forty or Fight!" Referred To