Before it, wars aimed at changing borders were due to limited confrontations, they were often solved with marriage diplomacy, always ended up in some sort of treaty regulating the matter. After the rise of nationalism, changing borders became a matter concerned with the sanctity of the nation.
https://feedly.com/i/entry/B7jw4LCucCLXhd0mcd9EmMn+sbxtNLGOdNAs60PDOTo=_165aed2fe1e:b0ea93:3097813d
