What did eighteenth-century German and Scots-Irish immigrants to the middle colonies have in common?

Both groups preferred to settle among their own kind.

Explanation:

The Middle Colonies were the subset of the thirteen colonies in the British America which is located between new England colonies and Southern colonies. This includes New York, New Jersey, Pennsylvania, Delaware, etc.

The middle colonies had a fertile soil that allowed it to become the major exporter of wheat. It attracted many immigrants across the near the places. The German immigrated around 1717 in different sects mainly from Rhineland. It also attracted the Scots-Irish immigrants to the land and they settled mainly in Pennsylvania.

All these immigrants to the middle colonies prefer to settle with their won kind.