In the Mexican Cession of the Treaty of Guadalupe Hidalgo which ended the Mexican American War.
The US bought Alaska from Russia in 1867.
The US does not have control over the Cuban economy.
The US never had control of Rumania
We built it
The US gained land on the Mexicans in year 1967 this happened because while the US was taking control the Mexicans were to busy eating tacos.
more land
The United States never had to fight a war to gain control of Texas and other southwest territories, such as the California territory. Texas was annexed in a time of peace in 1845 by the US; however, this provoked anger from the Mexican government which still did not recognize the independence of the Republic of Texas, and claimed it as still their own territory, albeit a "troublesome one." As a result of the US annexation of Texas, the Mexican-American War broke out.
California and the American Southwest.
Some of California and New Mexico
They gained California I think
Venesual
It bought Alaska in 1867.