Answer:
The answer is gunpowder
Explanation:
An Era of Prosperity and Innovation
It also had become the most advanced. important technological advances during the Tang and Song eras. Among the most important inventions were movable type and gunpowder.
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Answer B -Prelude to the crisis
The free city of West Berlin, surrounded by the communist German Democratic Republic (East Germany), was a Cold War crucible for the United States and the Soviet Union, in which both superpowers repeatedly asserted their claims to dominance in Europe.
In the United States is state Texas.
