Board Thread:Theories and Speculation/@comment-32617252-20180630214116/@comment-734582-20180701083454

The Curse is simply the Uchiha circumstance. Their easy access to power makes them dependent on it. The more the Clan endures, the more power they get. The more power they have, the more dependent on power they become. This cuts off other avenues of resolution, further alienating them and further pushing them down a path of war and conflict. This conflict creates more suffering, more suffering creates more power, more power creates more conflict.

Breaking this curse requires breaking this chain. Naruto and Gaara taught the Alliance to forgive, to recognize that everyone had suffered. Recognizing this, the people changed. Eventually, this got through to Sasuke who gave up on his ideas of doing everything by his own power. And with this cycle broken, the curse is broken.