The United States has agreements in force with 20 countries: Australia, Bahrain, Canada, Chile, Colombia, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Israel, Jordan, Mexico, Morocco, Nicaragua, Oman, Panama, Peru, Singapore, and South Korea.
1899, the United States declared the Open Door Policy. The Americans worried that other nations would soon divide China into formal colonies and shut out the American traders. They proposed that China's doors be open to merchants of all nations.
