d. the ties between colonists and American Indians.
Explanation:
During the first few years of the Plymouth colony, the pilgrims faced a lot of hardship. Farming in a new land was difficult, and the winters were very harsh. However, after a few years, the food supply had grown considerably. In the autumn of 1621, the Pilgrims had enough supplies to celebrate, and they expressed their gratitude through a feast that resembled the English tradition of Harvest Festival. Many Native Americans who had helped the colony survive joined. The tradition was repeated each year.
