Through about a 350 year period starting around 1500, national states became the norm , as they were the only states that could afford the military means to fight the kind of large-scale wars that were occurring .States , in other words, became transformed vy war. Tilly notes that the three types of states noted above all converged on one version of the state,do now that is seen as the norm. Yet,in contrast to neo-realism. Till y notes that the state has not been of one form throughout its history.His work shows how different types of state have existed,all with different combinations of states have existed,all with different combinations of class structures and modes of operating.And,crucially,its is war that explains the convergence of there types of the states into the national state form. War plays this central role because it is though preparing for war that states gain their powers as they have to build up an infrastructure of taxtion, supply and administration. The national state thus acquires more and more power over its population by its involvement in war and therefore could dominate other state forms because they were more efficient than either tribute-gathering empires or city- states in the process.