Answer: I think they never said they could... but I don't know history-
Explanation: The Open Door policy was a statement of principles initiated by the United States in 1899 and 1900. It called for protection of equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity. The main reason the United States announced the Open Door Policy is to ensure that U.S. businesses could operate in China. The backlash against foreigners led to widespread killings of missionaries working in China and an increase in nationalist feelings among the Chinese. The Boxer Rebellion was one of the most important events caused by this anti-foreign movement.
Cuba threatened to start a war between the United states and the Soviet Union. The Cuban Missile Crisis was the closest the United States of america and the Soviet Union came closest to War. Ultimately it was resolved peacefully.
The battle was a crushing defeat for the Confederacy. Union casualties in the battle numbered 23,000, while the Confederates had lost some 28,000 men–more than a third of Lee's army.
