1. Original 13 colonies- 1776

2. Original 13 colonies-

3. Northwest Territories- 1763Treaty of Paris-1783

4. Northwest Territories Treaty of Paris Original 13 colonies

5. Louisiana Purchase- 1803

6. Louisiana Purchase Treaty of Paris Northwest Territories Original 13 colonies

7. Texas Annexation- 1845

8. Louisiana Purchase Northwest Territories Treaty of Paris Original 13 colonies Texas Annexation

9. Oregon Territories- 1846

10. Oregon Territories Texas Annexation Louisiana Purchase Northwest Territories Treaty of Paris Original 13 colonies

11. Mexican Cession-1848

12. Mexican Cession Oregon Territories Texas Annexation Louisiana Purchase Northwest Territories Treaty of Paris Original 13 colonies

13. Gadsden Purchase- 1853

14. Gadsden Purchase Mexican Cession Texas Annexation Oregon Territories Louisiana Purchase Northwest Territories Treaty of Paris Original 13 colonies

15. Extra territories to complete the USA

16. Gadsden Purchase Mexican Cession Texas Annexation Oregon Territories Louisiana Purchase Northwest Territories Treaty of Paris Original 13 colonies Claimed by US 1810-1813 Ceded by GB- 1842 (Maine)Ceded by GB- 1818 (Red River Valley, ND) Adams- Onis Treaty- 1819 Ceded by Spain