The European debt problem has been building since WWI.
The huge losses on the battlefield left the entire population feeling they were "owed" a debt by their Nation's.
This dissatisfaction was used by the communist international to spread subversion, and unrest through out the continent, Spartacists in Germany, Communist uprisings in Austria,Italy, France, and Spain, and the growth of communist and socialist groups in the UK.
In order to end the continued violence that national Govt's no longer had the stomach to fight, they applied the same appeasement tactics that would work so well with Hitler by granting more benefits.
But none of them had any money, they were all hugely in debt already due to war expenses, so they shuffled things and remained on the verge of solvency. Some countries, like England never did recover. The only European country that truly recovered was Germany and that was not until the late 50's.
The trend has continued to the present day, Socialist labor unions start raising hell because they can gain advantage by telling the workers some one owes them something and the Govt's appease them with more bennies, more hand outs and shorter hours. Greece , Italy and France have been the most obvious examples but they have all followed the same pattern, they have been spending more than they have been earning and now they are running out of everybody else's money.
But the communist Unions would rather have the countries collapse than give up a bit of their inflated wages or actually do a full weeks work because chaos benefits the totalitarian ( socialist) parties .
And the stupid Democrats think it's wonderful and want to be just like them.