Europe's principles can be understood in its charter of fundamental human rights, summarized here: https://en.wikipedia.org/wiki/Charter_of_Fundamental_Rights_of_the_European_Union#The_text
Tenets of the fourth title are thought of as socialism elsewhere. Advocating healthcare and university education for all for example is radical in the USA; in Europe those are considered precepts of a well-functioning society, alongside limits on working hours and good/safe working conditions.
Europe's ideas began to take shape in the 17th and 18th centuries, but didn't reach their current form until after WW2. The notion of a social contract between the individual and his society can be traced to thinkers like Jean-Jacques Rousseau and John Locke.
The continent strives to be orderly and organized; it strictly enforces its rules upon new member states and penalizes those who try to flout them, as Ireland attempted with corporate taxation recently. I venture that these principles of social and economic justice were enacted by those with P trait, particularly NP and NPA types, although all personalities doubtless played a role.
Hope this answers your question.