Question

in the 1840s, the slogan \54-40 or fight!\ was used to support american annexation of
a. oregon.
b. texas.
c. new mexico.

Explanation:

The slogan "54-40 or Fight!" referred to the northern boundary of the Oregon Territory (54°40' N latitude). It was a rallying cry for American expansionists pushing to annex the entire Oregon region from Britain in the 1840s.

Answer:

A. Oregon.