Answer:
Racism and superiority.
Step-by-step explanation:
Racism and concept of superiority are the two ways through which the rich white landowners kept poor whites people and enslaved people from joining together against them. Due to racism, the poor white people and the black slave people did not come close together and fought for their rights mutually against wealthy white landowners. The poor white people thought themselves superior to black enslaved which prevent them from united as one.