What made philadephia a great area for factories and trade?

Philadelphia was great for trading and factories because it was on a river, located along the Delaware River and Schuylkill River, in the greater Delaware Valley.

People here in Philadelphia traded lumber, coal, furs, textiles, and bricks.

Philadelphia was a trade center for the colonies that based an important part of its economy on trade with the advantage that was located next to the river and had ports.

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during the hitler era and it caused them to declare war on germany