The Triangle Shirtwaist played an important role in bringing about labor reforms in the United States.
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Slavery was still an issue, so Congress had to pass the Missouri Compromise. There were equal amounts of slave and free states before Missouri requested statehood, so there was much debate on whether Missouri should represent a free or a slave state in Congress, meaning whichever group it represented would get more representation in Congress. So, Maine was admitted as a free state at the same time Missouri was admitted as a slave state, creating the Missouri Compromise.
No. This was called World War 2 because it was the second war that was held on such a large scale that it encompassed all the great forces of the entire world, from Europe to America to Asia and Australia. Before it was World War 1, which wasn't numbered since nobody expected world war 2 to happen, so it was called the Great War.