In early North America, one of the key cultural activities that allowed larger groups of people to live together was agriculture, particularly the cultivation of crops like maize (corn), beans, and squash, often referred to as the "Three Sisters." The development of agriculture provided a reliable food source, which supported larger, more sedentary populations. This shift from nomadic lifestyles to settled farming communities enabled the establishment of complex societies, towns, and eventually, cities, facilitating social organization, trade, and cultural exchange among different groups.
Additionally, other cultural activities, such as communal hunting, fishing, and the building of large structures for gatherings (like longhouses or kivas), contributed to social cohesion and the ability of larger groups to live and thrive together.