The sate that is now Texas.
The US victory in the Mexican-American war meant that the land (now Utah) that was occupied by the Mormons was now a part of the United States.
They purchased the Mexican states of Alta California and Nuevo Mexico plus the later Gadsden Purchase.
The title of the land that the US gained from Mexico from the war was known as the Mexican Cession. If you mean the chunk of land US bought from Mexico to build railroads that would be the Gadsden Purchase.
Land was annexed to the US as part of the treaty ending the Mexican War. The US was in a position to gain a favorable settlement to the question of whether the people in Texas and California had the right to join the US.
The US received the Mexican States of Alta California and Nuevo Mexico as well as setting the Rio Grande as the US and Mexico border.
A lot of this land was won by the United States in the Mexican-American War.
The former Mexican States of Alta California and Nuevo Mexico became a part of the US land area as provided in the Treaty of Guadalupe Hidalgo.
the United states paid Mexico $15 million dollars for this land, which became known as the mexican cession
Half of Mexico's land was claimed by the United States.
A lot of this land was won by the United States in the Mexican-American War.
The US victory in the Mexican-American war meant that the land (now Utah) that was occupied by the Mormons was now a part of the United States.
The Neuces Strip and the Mexican States of Alta California and Nuevo Mexico.
They purchased the Mexican states of Alta California and Nuevo Mexico plus the later Gadsden Purchase.
1.36 million square kilometers (525,000 square miles), or 55% of the original Mexican territory.
Mexican Cession
The four states that touch Mexican soil are:California, Arizona, New Mexico, and Texas
This question needs to have more detail because it is not understood by what you mean by land. All states are made of land.