The European Union went through several crises. The European debt crisis caused severe economic problems to several eurozone member states, most severely Greece. The 2015 migration crisis led to several million people entering the EU illegally in a short period of time. There was a significant rise in the vote shares of several eurosceptic parties, including the League in Italy, Alternative for Germany, and the Finns Party in Finland. As a result of a referendum, the United Kingdom became the first member state in the EU's history to initiate proceedings for leaving the Union.