Answer:
Great Britain, France, the Soviet Union, and the United States
Answer:
Manifest Destiny must be.
Explanation:
They were a strength to the Union. They carried soldiers and supplies to the battlefront much quicker, from a few months' march to a week. Having the supplies quicker to the battleground gave the Union the advantage over the Confederates, since the Union could recover much faster from any loss.
This plan was called the "Open Door Policy". This policy was proposed by the USA in 1899. Under this, all western nations would have equal opportunities to trade in China. Thiss was in support of Chinese territorial and administrative integrity. It lasted for 40 years and it became the foundation for the American foreign policy in East Asia at that time.
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