Answer:
Explanation:
The United States advanced an open-door policy to promote free and open trade in China. The Open Door policy was an international trade agreement between the United States and several foreign nations over trade with China.
The Wilmot proviso states that slavery must be eliminated from the land that has been acquired from the result of the Mexican War. The Wilmot proviso was an American law that bans slavery to the acquired parts of the Mexico after the war and lead to the American Civil War.
To improve the economy I believe (but not for certain)
