What geographic feature allowed people to settle on the North American continent ?

In my world history class the answer was land bridges. I’m not sure if that is 100% correct!

Explanation:

in which two ways were the northeast woodland indians and the southeast indians similar? both collaborated to form the iroquois confederacy. both cultivated the crops of corn, beans, and squash. both lived in rich environments of swamps and rivers. both lived in tree-bark dwellings called wigwams. both expected men to hunt, while women farmed.