Previous military policies had created massive killings throughout long years on a war of aggression. Brinkmanship, as showed in history was used to let another country stop its war through massive retaliation. It is a more dangerous option to use nuclear weapons as a sign of power and capability to kill more people including civilians in a fast mode.
Oliver Hudson Kelley hope this helps

The Reforms of Cleisthenes - the tribes

Athenian citizen storming the Acropolis, from The Greeks documentary
The 'democratic' reforms of Cleisthenes were a highly complicated revision of tribal and religious associations that had endured for centuries. Above all else, they were an attempt to make the different factions and regions of Athens into one people, with a popular assembly, and the necessary institutions to make that assembly work.
Link:
https://www.pbs.org/empires/thegreeks/background/10a.html
The president either approves or vetos laws