Okonkwo commits suicide because he loses his place as a man in his culture he kills himself out of frustration in defending his manhood.Okonkwo's people couldn't bury him like any other man.only strangers can.His people wanted to make sacrifices to cleanse the desecrated land
The cultural significance of Okonkwo's suicide and burial is that his culture is against it because they believe that it is an abomination for a man to take his own life it's an offense against earth and he should not be buried by his people.
Okonkwo culture