What is the main conflict in Nostromo by Joseph Conrad?

Nostromo, or Our Man, is an Italian sailor whose personal charm and organizational powers make him the cherished pet of the aristocracy of a fictional Central American country called Costaguana. After risking his life repeatedly, Nostromo comes to realize that he is just a pawn in the political and personal struggles of this fictional land. His plans for revenge parallel the so-called democratic movement of the richest province of Costaguana to become an independent nation ruled by the same aristocratic elite that has used Nostromo for their own gain.