The American Dream is individualistic. Martin Luther King's dream was collective. The American Dream says, "I can engage in upward mobility and live the good life. " King's dream was fundamentally Christian. His commitment to radical love had everything to do with his commitment to Jesus of Nazareth, and his dream had everything to do with community, with a "we" consciousness that included poor and working people around the world, not just black people.
Happiness is when what you think, what you say, and what you do are in harmony.