Long before Europeans arrived, indigenous peoples across North America had developed sophisticated farming systems without the use of draft animals or metal tools. The arriving Europeans faced unfamiliar climates and soils, so the adaptation of native agricultural knowledge and practices became critical for survival. Moreover, the indigenous adopted crops were better suited to local conditions than European grains. These crops supported population growth and trade networks and helped lay the foundation for an agrarian economy that dominated colonial life. As the colonies grew, the indigenous crops and techniques helped them become less dependent on British imports and help foster economic independence. Farming was idealized as a virtuous profession and by the time the Revolution was fought, the American colonial society was 90% agrarian. The importance of agriculture in the Colonies's struggle for independence by providing the necessary food supply for the Continental Army and the American population cannot be overstated.