What causes the downfall of Okonkwo in Things Fall Apart?

Okonkwo has an excessive fear of being like his father, so as a result, he begins at an early age to prove to his tribe that he is strong and brave. As a result, he becomes an aggressive, angry, violent man in trying to distance himself from his father. His father was lazy and a poor provider for his family. Okonkwo's determination helps him succeed, but it also is partially responsible for his downfall. His anger and violence causes him to committ acts that damage his reputation. The more he achieves, the less he enjoys it because his fear of failure is always there, reminding him that he must continually prove himself to be better than his father. During his exile, Okonkwo learns the value of promoting unity within his community, but it's too late. When he returns to his village, the missionaries have already influenced his tribe, and it is Okonkwo's excessive pride that won't allow him to accept this. He's angry that his people don't support him in his fight against the Europeans, and he allows his fear of failure to blind him to the inevitability of European interference in the traditional beliefs of his people. Again, Okonkwo's anger and violence get the best of him, and he committs his final desperate act of vengeance. His suicide signals his spiritual alienation from his traditional beliefs.