Which area of land was gained when President Polk made a treaty to split the region to avoid war with Britain?

Which area of land was gained when Congress agreed to add it to the United States after it had been an independent country for 10 years?

Which area of land was gained when the U.S. asked to buy it from Mexico to build a southern railroad?

Which area of land was gained when the U.S. won a war against Mexico?

Which map is showing the Mexican Cession?

Which map is showing Oregon Country?

Which map is showing the Gadsden Purchase?

Which map is showing the Louisiana Purchase?

Which map is showing the Texas Annexation?

Which area of land gave American farmers free navigation of the entire Mississippi River?

Which area of land was originally home to the Seminole tribe that waged a 7-year war to resist dispossession?

Which area of land was gained when the U.S. told Spain to "govern or get out"?