Answer is D.
Germany out of those 4 countries had the most dramatic territorial changes during that time period.
I believe it is A, constantine the great built the city etc.
North korea!~~~~~~~~~~~~~~~~~~~~~~
D Although the U.S. had ramped up its industry during the first world war, it still did not have its full industrial capacity maximized until 1942 during world war 2. It was not "the" world leader in industry, however it was on the top of the list
