The transition from a mono-party Communist regime to liberal democracy and pluralism resulted in new political parties mushrooming in the early 1990s.
The threshold was set at the national, rather than divisional, level, and had the effect of preventing many minor parties from winning seats in later elections.
The right has largely comprised (former) Solidarity activists and supporters, but experienced deep divisions from the beginning, and showed less cohesiveness than the left.
The right were unable to create a single bloc which could act as a lasting counterweight to the left-wing monolith, but instead, kept merging, splitting and renaming.
The new competing groupings are those of the Law and Justice party (promoting economic interventionism and social conservatism) and the Civic Platform (representing a more liberal-conservative position).