Why did Christianity spread across Africa in the second century?

Christianity in Africa began in Egypt in the middle of the 1st century. By the end of the 2nd century it had reached the region around Carthage. Important Africans who influenced the early development of Christianity include Tertullian, Perpetua, Felicity, Clement of Alexandria, Origen of Alexandria, Cyprian, Athanasius and Augustine of Hippo. In the 4th century the Aksumite empire was Christianized, and the Nubian kingdoms of Nobatia, Makuria and Alodia followed two centuries later.

Explanation:

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2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.