Which of the following describes a difference between american and european economic imperialism in china during the 19th century

Americans instituted an Open Door Policy both in China and Japan while Europeans insisted themselves by bringing addiction to the Chinese in the form of opium. Americans wanted to expand their trade and economy by creating the Open Door Policy for China to open their doors to the Americans. British people did not do this, they forced themselves into China which eventually led to their demise---the Opium Wars.