How did Texas attain its current borders?
- Wikipedia: Spanish Texas.
- Wikipedia: Adams - Oniz Treaty.
- Wikipedia: Mexican Texas.
- Wikipedia: Coahuila y Tejas.
- Wikipedia: Santa Anna, Central Republic, 1835.
- Wikipedia: Centralist Republic of Mexico.
- Timing of the various rebellions against the central Mexican state in the 1830s and 1840s.
- Map of the Republic of Texas.
- From Wikipedia: Republic of the Rio Grande.
- A Map of the United States of Mexico, 1846.
- Mexican Cession
- Treaty of Guadalupe Hidalgo.
- From Wikipedia: Plan of San Diego.
- Current Borders of Texas.
- Annexation History - Planning and Development Department - City of Houston.