| 1 | Middle America is a fragmented realm that consists of all the mainland countries from Mexico to Panama and all the islands of the Caribbean Sea to the east. |
| 2 | Middle America's mainland constitutes a crucial barrier between Atlantic and Pacific waters. In physiographic terms, this is an intercontinental land bridge. |
| 3 | Middle America's tropical location and climates are in important places ameliorated by altitude and its resulting vertical zonation of natural environments. |
| 4 | Middle America is a realm of intense cultural and political fragmentation. The political geography defies unification efforts, and instability is now at an all-time high. |
| 5 | Middle America's cultural geography is complex. African influences dominate the Caribbean, whereas Indian traditions survive on the mainland. |
| 6 | Middle America's historical geography is replete with involvement by its powerful neighbour, the United States. |
| 7 | Underdevelopment is endemic in Middle America. The realm contains the Americas' least developed territories. |
| 8 | In terms of area, population, and economic strength, Mexico dominates the realm. |
| 9 | Out-migration of population for economic and political reasons continues. |
| 10 | The realm (notably Mexico) contains major actual and potential reserves of mineral fuels. |