Context: Furthermore, in the case of far-right, far-left and regionalism parties in the national parliaments of much of the European Union, mainstream political parties may form an informal cordon sanitarian which applies a policy of non-cooperation towards those "Outsider Parties" present in the legislature which are viewed as 'anti-system' or otherwise unacceptable for government. Cordon Sanitarian, however, have been increasingly abandoned over the past two decades in multi-party democracies as the pressure to construct broad coalitions in order to win elections – along with the increased willingness of outsider parties themselves to participate in government – has led to many such parties entering electoral and government coalitions.

Question: Will mainstream political parties not cooperate towards outsider parties if they are too extream?
Answer: mainstream political parties may form an informal cordon sanitarian which applies a policy of non-cooperation towards those "Outsider Parties"

Question: which  outsider parties considered unacceptable to work with?
Answer: far-right, far-left and regionalism

Question: What has been increasingly abandoned in the past two decades?
Answer: Cordon Sanitarian

Question: What has caused far-right parties to be abandoned over the past two decades?
Answer: Unanswerable

Question: What kind of democracies were created after the formation of the EU?
Answer: Unanswerable

Question: What groups have Outsider Parties not wanted to cooperate with recently?
Answer: Unanswerable

Question: What did Outsider Parties form because they didn't want to cooperate with government?
Answer: Unanswerable

Question: What kind of policy do Outsider Parties usually have towards the government?
Answer: Unanswerable