1) Jackson was pressured harshly by many to act upon the Native situation. He supported the ruling majority whom favored removing the natives. Being he believed that the majority ruling was a more direct representation of the people, he decided to go forward with displacing the natives.
2) Jackson claimed that the Cherokee nation would collapse like those before them. He saw how similar native unions failed, and predicted a similar fate for the future Cherokee.
3) Eventually, a party emerged strongly supporting the removal of the natives: the Treaty Party. Some party members were extreme on their position, influencing Jackson's decision significantly.
4) Unreasonable demands were relentlessly made by the Natives. This frustrated Jackson, as no progress was being made with such ridiculous demands having to continuously be rejected.
In the illustration prior, the Americans are tying down the Natives and running them out of their homes. They are restricting them from basic human rights primarily due to their race, ethnicity, and culture.