Northern Colonies were mostly mountains which included a colder climate The Northern Colonies chose to settle mainly for religious and political means The Northern Colonies economic stability was based on manufacturing and trade. Northern colonies had a much higher number of towns, and they tended to be larger (though most of them were still tiny by today's standards). The only true cities in North America such as New York and Boston were all in the North. Slavery was a major difference between North and South.Most Northern colonies had smallish slave populations or had populations ...