A. The Opium Wars.
The Chinese wanted the British to stop selling Opium in their country. So the British got mad and decided to have a war. The Chinese lost the war and had to open up to the British. After the British won the war, the Chinese legalized the buying, selling, and trading of Opium in their country.
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During WWI, Wilson was the president that entered America into the war after the Zimmerman Telegram was intercepted by British spies working in the U.S. during the war, the economy flourished due to the need for so much war materials. This allowed for the economy to maintain stability that lasted into the great Roaring 20's.
Mark brainliest