Arecent challenge to the european union created by a member state is?

A recent challenge to the EU created by a Member State (MS) is the Brexit.

The Brexit is the denomination given to the process that started in the EU after the UK (one of the MS) transmitted its desire to withdraw from the Union, after the celebration of a domestic referendum in which the 51.9 % of the voters supported the withdrawal option.

In 2017, the UK required the application of the Article 50 of the Treaty on European Union that regulates the withdrawals of MS. The UK is due to leave the EU on 29 March 2019 at 11 pm (British time).

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.

the chair is the committee member from the majority party who has the most seniority. in the south carolina senate, the chair is the committee member from the majority party who has the most committee seniority.