The March 2019 edition of the IRMO Brief, written by Ane Muhar Blanquart, deals with the decision of Great Britain leave the European Union. Brexit is the most important political event we are currently witnessing. It is expected to change the geopolitical narrative of not only the United Kingdom but, to an extent, the entire world. However, with the official parting day approaching, few things are certain, including whether and when Brexit is going to happen at all. This analysis explains the events that led to the referendum and the consequences it could have on Britain and its role in the world.