Final answer:
The Middle Colonies were the most diverse in terms of European population, partly because of Dutch settlement patterns and English immigration policies.
Step-by-step explanation:
The colonies that included people from the most diverse group of European countries were the Middle Colonies. This diversity arose partly from the Dutch settlement patterns, and later, from the rapid development and immigration to these areas following English acquisition. The Middle Colonies, which included New York, New Jersey, Pennsylvania, and Delaware, saw significant ethnic and religious diversity, which ultimately contributed to them becoming the fastest-growing region in North America during the colonial period.