They got the jobs because their was a shortage to the amount of workers there were, and so the companies couldn't be discriminate, because they got merchandise to make. However, after the war, many of the Americans returned, and the businesses wanted to give the jobs back to the White Americans, so they fired many of the African Americans that were previously holding the jobs during the war
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Germany lost it's colonies and had to take full responsibility for the war, Germany also could not have a military larger than <span>100,000 men and a navy of only </span>6 ships<span>, and it was not allowed to place any troops in the Rhineland. Germany had to pay £6,600 million 'reparations' for damage done.</span>
It was mainly the French Revolution, since this then caused the British to tax the Americans rather harshly.
He is the commander in chief
They had naval superiority. This meant they could form naval blockades to keep the central powers from getting supplies in and out. A disadvantage would be that France, Russia, and Britain were separated. Because of this, they could not supply each other.