To expand a bit more on my previous post.
The US has been able to get away with their massive deficits and poor fiscal decisions due to the fact that they can lean on creditor countries like Japan and China to buy up their debt. The US has been fortunate that the US dollar continues to be the defacto world trading currency. However things have been put into motion over the last several years especially where alternatives are starting to emerge like the Chinese Yuan for instance.
If the US continues to play things the same way it will reach a point where other countries will either refuse to buy up more debt or will start selling off their holdings in US debt as it will become increasingly clear that the US will be unable to service its debts. When this occurs it is safe to say that the US will go into an economic meltdown and will take many other countries down with them.
I suspect this may be the reason why the US has been getting more agressive militarily in the Middle East securing more resources while also relocating the majority of their naval power to the Pacific to contain China.
