I believe that the answer is experimentation.
Answer:::China is a vast country with a huge range of terrains and climates within it: mountains, deserts and coastlands and above all, the great river systems of China, the Yellow River to the north and the Yangtze to the south. All these have helped shape Chinese civilization
Explanation:
make me the brainlyst
The answer is "hawaii and alaska were added to the union".
I believe it was Canada, but we are now allies