The Open Door Policy was a United States foreign policy proposed in 1899-1900 that called for equal commercial access to China for all foreign countries. At the time, only major powers like Britain received special trade privileges in China. The Open Door Policy asked all foreign powers to respect China's territorial integrity while granting equal commercial terms. Most major European powers accepted the policy, though China itself did not. The United States worked to uphold the Open Door Policy during conflicts such as the Boxer Rebellion in 1900 and it was reaffirmed in 1922, though China began asserting more independence in the 1920s-1930s which increased tensions with Japan and led to war.