Greece made an absolutely moronic decision to give up sovereignty of their currency when joining the EU. As an aside - this is why Brexit is also moronic. They had the best of both worlds. EU membership and retained their currency.
If you want a more apt comparison to the US. Look at Japan. Their debt to GDP is something like 225%. Their ratio is astronomical, but because they dont have foriegn debt, that ratio is relatively meaningless. Much like the USA's They would die for a little inflation. But they're too dumb to realize they're heavily use consumption taxes, which suck that spending back out of the economy. L
If anyone tries to compare Greece's situation to the US or the Weimar Republic, a popular one for the liberatrian types, you can go ahead and stop paying attention to them. They dont know what they're talking about.
As long as the US has a fiat currency, and doesnt take on foreign debt (two things that will never change) the debt to gdp ratio is relatively meaningless.
Debt to GDP matters for countries that dont control their own currency, like EU members or countries that pin their currency to others like the US Dollar (many south American countries)
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i give it about 80 years. but i only need about 40 
