The purpose of the open door policy was to give all nations equal rights when trading with china.
<span>Colonies sought to reduce costs by concentrating on one cash crop rather than many. </span>
Around 220 B.C., Qin Shi Huang, the first emperor of a unified China under the Qin Dynasty, ordered that earlier fortifications between states be removed and a number of existing walls along the northern border be joined into a single system that would extend for more than 10,000 li (a li is about one-third of a mile) .
Explanation:
