The type of program being talked about in the question is called cognitive behavioral therapy. Cognitive behavioral therapy is a type of psycho-social intervention used in improving mental health. This type of therapy aims to help individuals manage their problems by changing the way they think and behave.
Enough power so that it could have and sustain a legislative body, the main governing body, a judge court, the military body.
PLUS:
taxes: funds for the gov't
obeying laws: gov't will receive more power over people if they obey (and money)
I would say mostly economic factors: common currency, common market, wide-scale trade among the countries. If one country is hit, the others will also suffer: this brings in the feeling of solidarity.
other than that, European culture is actually quite unified, with many shared valued, such as universal health care and religious freedom, yet connection to Christianity.
