| A | B |
|---|
| Atlantic Ocean | Highway for explorers, early settlers, and immigrants. |
| Pacific Ocean | Early destination for explorers. |
| Ohio River | Gateway to the west. |
| Great Lakes | Inland port cities grew along here. |
| Mississippi-Missouri Rivers | Used to transport farming & industrial products. |
| Columbia River | Explored by Lewis and Clark. |
| Colorado River | Used by the Spanish to explore into the Southwest. |
| Rio Grande River | Forms a border between the US and Mexico. |
| Gulf of Mexico | Used by the Spanish & French to explore Mexico and other parts of the New World. explore |
| St. Lawrence River | Forms part of the Northeast border between the US and Canada. Connects Great Lakes to Atlantic Ocean. |
