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They were afraid that all acquired territories would become slave states.
The extension of slavery into territories acquired from mexico
It was acquired from Spain. It never belonged to Mexico.
Mexico
Mexico is a federal republic, composed of 31 states and one federal district. In fact, United Mexican States is the official name for Mexico.Each state is in turn divided into several municipalities, akin to US' counties. Instead of using municipalities, the Federal District is divided into boroughs.
The Gadsden Purchase was the first state after Mexico to be created from the land acquired.
The vast new territories acquired from Mexico - which ones would be slave-states, and which ones would be free soil.
Mexico offered to buy Texas from Mexico.
As the war was motivated by pro-slavery interests, northerners feared the acquired territory would be used by slavers (they did, especially on New Mexico and Texas). This eventually upset the balance of power between pro and anti slave interests and resulted in the American Civil War (1861-1865).
June 1846
I guess you mean the state of New Mexico, which was acquired during the Mexican-American War (1846-1848). If you mean the country of Mexico, it has been an independent country since 1810.
All of them were acquired form Mexico.