What fossil discovered in the 1950s reinforced the hypothesis that Africa was the birthplace of humanity?

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The fossil discovered in the 1950s that reinforced the hypothesis that Africa was the birthplace of humanity was the "Australopithecus Africanus."

At the end of the 1940s, beginning of the 1950s, renowned archeologists  John T Robinson and Robert Broom excavated the Sterkfontein Caves in South Africa and discovered a 2.3 million-year-old fossil they called "Mrs. Ples," or the Australopithecus Africanus.

Anthropologists consider that South Africa is the cradle of humanity. They think that the first hominids appeared there and they spread to other regions of the earth. The oldest one of the hominids was the Australopithecus and it is considered to have appeared on earth approximately five million years ago. The latest form of hominids, the H*mo Sapiens -you and I- appeared approximately 200,000 years ago.