What effect did the Native Americans have on Europeans?

In a practical sense, Native Americans influenced the European diet in profound ways. Native Americans cultivated foods that were unknown to the Europeans before first contact. Important foods introduced to Europe included tomatoes, potatoes, and maize (corn). These are now such staples that it is hard to imagine there was a time when Europeans did not eat them. Potatoes were so easy to grow and so nutritious that the Irish, for example, relied on them too heavily. When a potato blight came and potato crops were destroyed, many starved.
In a more philosophical sense, the cultural contact and cultural differences led Europeans thinkers to question their own values and way of life. The idea of the "Noble Savage" developed, which saw the Native Americans as superior to the Europeans because of their simpler way of life.