nation states in the 1800s (and sometimes today) did use armed forces for hire. But I think nation states in general did not come about in relationship to private or state armies, but in relation to feudal arrangements of smaller provincial rule by princes and estate rule by lords.
My impression is that in places like France or Germany there was a more conscious effort to create a united nation out of these smaller political rulerships because the needs of capital are different than the needs of feudal exploitation. Feudal rulers ruled through control of specific areas of land and specific groups of peasants. Capitalism works better with a pool of mobile workers and wealth not tied to land but to the ability to exchange and move capital. But a nation state is utilized by capitalists in order to aid competition with other groups of capitalists, to create favorable conditions for production within a geographical area, to create favorable conditions for creating proletarians (moving people off the commons, creating a national language and later for schooling that can create certain skills or ability to be wage-laborers that can work but aren't specialized).
National armies came about differently in different places. But generally they were needed by capitalists to ensure trade routes, to enforce and project national interests of the ruling capitalists, to put down resistance (to capitalist modernization) by the peasent and uprisings by laborers.
This is my general and crude impression of this. None of it developed in a vaccume so a lot depended on when and where capitalism developed. But once one group of capitalists had organized their own national power feudal powers could not compete as well economically (and so in some places -japan or Germany - the state was organized to help usher in capitalist relations, whereas in other places capitalists developed the state to suit their interests as they developed) and other groups of capitalists needed to similarly organize their rule or else fall behind or stay weak.


Plus this is the first thing I have written that is of this complexity for a little while; it might be too low brow for this forum?
