Before, armies were measured mostly in the tens of thousands of professional soldiers. Thanks to new industrial processes that could make arms easy enough for common peasants to quickly be trained up to the point of lethality, you could have something actually revolutionary - a national draft capable of fielding millions of soldiers. (Not that they were the first to act on that idea… ahem.) But they were the first to consider the common person a modern citizen and that citizens were in a sense owned by the collective nation.
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