Section #1 - Lincoln’s Long Journey Home to Racial Equality
Chapter 10: Mexico Cedes Its North America Land to the United States
In the 1848 Treaty of Guadalupe Hidalgo, Mexico surrenders 589 million acres or 55% of its total land to the U.S. in exchange for $15 million – or 2.5 cents per acre.
As opponents of the war feared, Washington is immediately embroiled in controversy over whether or not slavery will be allowed in the new territory.

(Kballen, CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons)