Why did the EU disintegrate?

The EU has not disintegrated! Is facing a disintegration crisis! The reason is: 1 One of the most important problems facing Europe at present is the population problem. On the one hand, European countries, especially industrialized countries, have gradually entered an aging society, and baby boomers have basically reached retirement age after World War II. At the same time, the progress of science and technology has continuously extended the life span of mankind. On the other hand, the fertility rate in many European countries is declining. With more and more people joining the ranks of the elderly and the shortage of the new generation, young people in Europe are no longer willing to bear the burden brought by the high welfare system. This will lead to the younger generation of immigrants in Europe. 2. Financial crisis, leading to financial crisis and debt crisis. 3. Terrorism and immigrant integration