United States Congress - Wikipedia
United States Constitution - Wikipedia
Whether or not the United States could have obtained California without war is a more difficult hypothetical question. That Mexico might have been willing to sell all or part of California is indicated by the fact that, in 1846, Santa Anna offered to cede Alta California to Great Britain in an attempt to keep it out of American hands. The British declined the offer and encouraged Mexico to settle its differences with the United States. Given Mexican fears of racially-charged Anglo imperialism, the U.S.
The Age of Imperialism - Small Planet Communications, …
17The classic work on American imperialism at the turn of the 20th century remains WalterLaFeber, New Empire: An Interpretation of American Expansion, 1860–1898, 35thAnniversary ed. (Ithaca: Cornell University Press, 1998). See also Jeannette P. Nichols,“The United States Congress and Imperialism, 1861–1897,” Journal of Economic History 21,no. 4 (December 1961).