What legacy did Buddhism leave behind?

Answer 1

The dharma, his teachings, the insight into the truth he saw, and the skills he taught to gain a better understanding of that truth, and put it into practice in one's life.

When the Buddha's wife saw him for the first time after his enlightenment, after many years apart, legend has it that she told her son to go collect his legacy from his father; the Buddha took his son into the monastic order as a novice to teach him about the dharma.

Answer 2

The full legacy of Buddhism in this era is unknown because it is still evolving. The legacy of vthe Buddha is illuminating a path leading to permanent happiness.