Answer :

Farming affected the native Americans greatly, because before the native Americans were introduced to farming they had little choices for food/trade

The most important way in which farming affected Native Americans is that the extensive use of land for farming of the settlers led them to try to push the Native Americans out of their traditional lands. As Native Americans were often located in the areas with the most fertile soil, the land was considered desirable for settlers, and this created a lot of violent conflict between the two groups.