Maybe we need to say sth about how we behaved when we had "super power". What kind of system we had. It is very important we had created our commonwealth using positive power.

I think the most popular source on this forum Wikipedia ;)
http://en.wikipedia.org/wiki/Polish-Lithuanian_Commonwealth"The Polish-Lithuanian Commonwealth, official Rzeczpospolita Korony Polskiej i Wielkiego Księstwa Litewskiego [1], also known as the First Polish Republic or Republic (Commonwealth) of the Two (Both) Nations (Peoples), (Polish: Pierwsza Rzeczpospolita or Rzeczpospolita Obojga Narodów; Lithuanian: Abiejų tautų respublika) or as the "First Republic," was one of the largest and most populous[2] countries in 17th century Europe. Its political structure — that of a semi-federal, semi-confederal aristocratic republic"
"The Commonwealth was an extension of the Polish-Lithuanian Union, a personal union between those two states that had existed from 1386 (see Union of Krewo). The Commonwealth's political system, often called the Noble's democracy or Golden Freedom, was characterized by the sovereign's power being reduced by laws and the legislature (Sejm) controlled by the nobility (szlachta).
This system was a precursor of the modern concepts of broader democracy and constitutional monarchy"
"Shortly before its demise, the Commonwealth adopted the world's second-oldest codified national constitution in modern history."
"The foundation of the Commonwealth's political system, the "Golden Liberty" (Polish: Zlota Wolność, a term used from 1573), included:
free election of the king by all nobles wishing to participate;
Sejm, the Commonwealth parliament which the king was required to hold every two years;
pacta conventa (Latin), "agreed-to agreements" negotiated with the king-elect, including a bill of rights, binding on the king, derived from the earlier King Henry's Articles;
rokosz (insurrection), the right of szlachta to form a legal rebellion against a king who violated their guaranteed freedoms;
liberum veto (Latin), the right of an individual Sejm deputy to oppose a decision by the majority in a Sejm session; the voicing of such a "free veto" nullified all the legislation that had been passed at that session; during the crisis of the second half of the 17th century, Polish nobles could also use the liberum veto in provincial sejmiks;
konfederacja (from the Latin confederatio), the right to form an organization to force through a common political aim."
"Golden Liberty created a state that was unusual for its time, although somewhat similar political systems existed in the contemporary city-states like the Republic of Venice. (interestingly both states were styled the "Most Serene Republic.") At a time when most European countries were headed toward centralization, absolute monarchy and religious and dynastic warfare, the Commonwealth experimented with decentralization, confederation and federation, democracy, religious tolerance and even pacifism. Since the Sejm usually vetoed a monarch's plans for war, this constitutes a notable argument for the democratic peace theory" it was in XVI century !! "democracy, since all the szlachta were equal in rights and privileges, and the Sejm could veto the king on important matters, including legislation (the adoption of new laws), foreign affairs, declaration of war, and taxation (changes of existing taxes or the levying of new ones).
Also, the 10% of Commonwealth population who enjoyed those political rights (the szlachta) was a substantially larger percentage than in any other European country; note that in 1831 in France only about 1% of the population had the right to vote, and in 1867 in the United Kingdom, only about 3%; "
Religions 
Green are orthodox (other names are simlar to english)
we have to say sth about arians (do not connect to WWII)
Polish pacifists (?!?) in XVI century ;) http://en.wikipedia.org/wiki/Polish_brethren"The movement started around 1562 and ended with the expulsion of Arians from Poland in 1658. The Brethren never participated in the Sandomierz Agreement between different Polish Protestants. The Polish Brethren advocated the separation of church and state and taught the equality and brotherhood of all people;
they opposed social privileges based on religious affiliation, and their adherents refused military service (they were known for carrying wooden swords instead of real almost obligatory szablas) and declined political office. They did not believe in private property, were against capital punishment, and did not believe in the traditional Christian doctrines of Hell or the Trinity."
And here is the answer how we ended with 95% of Catholics at the end ;) " The Deluge in which protestant Sweden invaded Poland, since they (as almost all non-Catholics)
were commonly seen as Swedish collaborators. This expulsion is sometimes taken as the beginning of decline of famous Polish religious freedom, although the decline started earlier and ended later: the last non-Catholic deputy was removed from parliament in the beginning of the 18th century. Most of Polish Brethren moved to the Netherlands, where they greatly influenced European opinion, becoming precursors to Enlightenment. Through their connection to Enlightenment thinkers, their ideas also influenced the Founding Fathers of the United States."
I've just noticed some analogies to other religous groups in our history ... hmmmm... maybe we should think about it.