2. How did the Iroquois become the largest and most powerful Native American group in the Eastern Woodlands? A. They conquered all the Native American groups that lived in the Eastern Woodlands. B. As expert farmers, they controlled a large group of villages. They had a thriving trade with other populations. C. They formed an alliance with two other groups to hold peace conferences every year. D. They formed an alliance of five Iroquois peoples, devoted to encouraging peaceful cooperation.