There are no eternally chosen races, ethnic groups or favored nation of God according to Islam. Each person and entire groups or nations have an opportunity to become the beloved of God by practicing the best conduct and sincere faith. The best people in the world are those who are the most righteous regardless of any other traits. Hence, entire nations are not accursed. The opportunity to be the best is open to all of us if we work towards it with true sincerity.