What best explains the diversity of the middle colonies?

The varied immigrant homelands

Explanation:

The Middle Colonies were a subset of the original Thirteen Colonies, which are roughly equivalent to the modern states of Delaware, New Jersey, New York and Pennsylvania. This area was the most ethnically and religiously diverse of the British colonies. In fact, a large number of the population came from England, Scotland, Ireland, the Netherlands, and German states.

they died because of a disease during the first spanish colonies.