Europe is running into problems because the austerity measures enacted are multiplying the effects of a weaker economy. Unfortunately, they've also painted themselves into a corner. They have too much debt and not enough growth to borrow more money at a favorable rate.
The US is in an entirely different situation. Our current debts are manageable and we have access to a glut of cheap money. Our problems stem from long term structural problems that must be solved now to avoid the situation Europe is now facing. We still are able to deficit spend now to keep the fragile economy growing, so long as we plan for future tax increases and spending cuts.