He probably was black. Ancient India was occupied by several black dynasties, like the Gupta for example. If you google, some of the oldest statues of the Buddha depict black features (lips, nose, etc.), but Buddha seems to be depicted in the likeness of his sculpters elongated ears are similar to African tradition. However, the suttas describe him as "golden" and the Buddha allegedly said himself that while he practiced paths before realization, he had starved himself for spiritual purposes, which he claimed was the wrong way to practice, and while he was starving, he described how his body was effected. His skin turned brown and black. Who knows if this is true to the Buddha's actual words? In Buddhism, it really doesn't matter what the color of his skin is.