The answer is d
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There was a lack of jobs for European countries while the US had many job opportunities.
The U.S. army in Europe was under the command of General John J. Pershing. At first, the U.S. had few trained troops to send over to Europe. However, the army was quickly built up through the draft and volunteers. By the end of the war around 2 million U.S. troops were in France. American troops on way to the front march thru London Source: Department of Defense The U.S. troops arrived just in time to turn the tide of the war in favor of the Allies. Both sides were exhausted and running out of soldiers. The influx of fresh troops helped to boost the morale of the Allies and played a major role in the defeat of the Germans.
In 1775 when the American Revolution began, the British and Americans had one of the most important battles at Fort Ticonderoga. Here the British Military base was attacked, and the capture of the fort became the first American victory. It boosted the morale of the Continental Army and would be a significant factor in the outcome of the revolution.
The colonists hoped that Fort Ticonderoga could stop the British Army from proceeding to the South.
The Fort had critical importance ranging from Ammanents that Americans had short of supply and had a collection of massive artillery (howitzers, cannons, and mortars).
The Forts location at the shores of Lake Champlain was also a strategic route to the British controlled provinces in the North and route along the thirteen colonies.
