Since the financial crisis the US economy has kept on trucking, while the EU has stagnated. This isn’t all because of the euro, but it’s definitely a disaster and I think it is reasonable to hold the euro at least partially responsible.

The US has much higher debt than any point in history, which is climbing rapidly, and are manipulating things as much as possible.

I wouldn’t hold them up as a shining example of “good” or “we should do the same”.

Take a long term view the US has done a lot better in the period it has had a common currency than the EU has done in the period it has had a common currency.

Even in recent decades the US has done much better economically than the EU.

The EU economy is a disaster? Unless we redefine 'economic disaster' to meaninglessness, I think you don't have ground to stand on.

Being the slowest growing major economy is hardly success.

The Euro crisis was a disaster for multiple countries.

'Slowest growing' is hardly disaster! 2008 was pretty bad for a few countries.

Why are you comparing EU against an economy that also has a common currency that cannot be manipulated by member states?

Because the US is structured in a way that makes a common currency workable. It has direct federal taxes, and a very large federal budget. The EU budget is a tiny fraction of total EU public spending.

There is a huge difference between EU states and US states.