D the plentiful forrest provided alot of lumber and helped fuel the shipbuilding industry ;)
Addressing problems that had led to the war
Coming up with ways to prevent future wars
Creating a League of Nations peace organization
Shi Huangdi
Hope that helps
Minnesota provided a large number of units in the American Civil War proportionate to its small population of approximately 170,000 in 1861-1865, with some 26,717 state volunteers being recorded, although a number of those are individuals who reenlisted in other units.