<span>I am pretty sure it was the Second Battle of the Marne but I am not a 100% <span>sure</span></span>
The Brooklyn Bridge is significant because it was the first suspension bridge built in New York, but it should be noted it is significant for other reasons as well.
World War II caused a massive reshifting in the world order in that prior to World War II, there were a number of world powers.
After World War II, only the United States and the Soviet Union remained as true world powers.