It seems you're looking to complete or clarify a statement regarding the settlement patterns in the Middle Colonies compared to the New England and Chesapeake colonies. Based on the context provided, the most fitting completion might be:
"In addition to natural increases and immigration, most new settlers to the region came as quickly as family units, allowing the Middle Colonies to become self-sustaining much more rapidly than the New England and Chesapeake colonies."
Family units contributed to a more stable and immediate establishment of communities, which supported agriculture and local economies. Would you like more information or a different type of completion?