Take a look at last year's report on unfunded liabilities in the European Union. The typical Euro state needs at least 4 1/2 times their annual GDP to maintain their current obligations. Spain is at the low end with slightly less than 2 1/2 times GDP. So how far behind in the "unsustainability race" do you think the USA is?
This is impossible to maintain anywhere in the world and all of these governments will collapse under the weight of social programming.