When were the Ancient African Terracotta portraits made?

The terracottas represent the earliest sculptural art in West Africa and were made between 900 B.C.E. and 0 C.E., concurrent with the earliest evidence of iron smelting in Africa south of the Sahara desert.

Explanation:

-an amendment is proposed.

-two-thirds of congress must approve.

-thee-quarters of states must approve.

-the proposed amendment becomes law.

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porter is writing economic history because he is focusing on the cost of developing vaccines.