Because there were to many convicts in jail so it caused overcrowding. America wouldn't take any more so they thought Australia would be suitable because of its isolation from the world.
Can you give more text of the question?
In this way, geography<span> kept early </span>China<span> culturally and economically isolated from the rest the world. However, </span>ancient Chinese<span> civilizations were exposed to the sheep and cattle herders inhabiting the grasslands in the northwest, and the fishing cultures along the southeast coasts.</span>
i think they did use them
