The way that peace kept in Europe despite rapid buildup of armies and weapons is: B. through economic agreements that recognized the interdependence of nations
Because of this interdependence, countries in Europe aware that attacking another countries might somehow damage one sector of their economy. On top of that, trade relations build up the feeling of comradely among the Europeans that make them see each other as allies rather rivals.
The basis of the division was social class I believe it was devised between the wealthy, middle, and lower class the lower class included slaves and indebted servants
