based on the map, what do boston, massachusetts, and new orleans, louisiana most likely have in common?

Both cities are ports. located in Eastern part of the United States.

Explanation:

As we can see on the map, Boston is located on the Pacific Ocean. It is one of the most important ports on the Atlantic, even since the colonial period. On the other side, New Orleans, which lies much southern is a part located on the Mississippi River, near the Mexican Gulf.