Which factors contributed to the establishment of the northeast as a core area within the world economy?

The contributing factors are:
-The Erie Canal and railroads gave easy access to the resources of the interior (which allow a much faster product and resource allocation form one region to another)
 - New European immigrants provided cheap labor for factories (which increase production efficiency)
- Northeastern cities had excellent locations for international trade
- Eastern cities had the nation's largest supply of capital which provided the money needed

The  ancient egyptians  who  built the pyramids  may have been  able  to move massive stone blocks across the desert by wetting the sand in front of a contraption  built  to pull the heavy objects