Besides the fact Mr USA seems to be dodgy....
The other problem with USA investments is currency risk.
You may make a profit of say $1000 USD, which today equates to about $950 AUD.
I would say the long term trend of the USD is DOWN. So your $1000USD profit in 10 years might end up being only $500AUD. And in 20 years the US Peso will probably only give you $100AUD.
Hahahahahahaha... they'll have another boom if that happens as it'll be even cheaper to manufacture in the US than it is in China/Korea/India/Indonesia/Africa/Vietnam
Sometimes I look at posts here and wonder what level of economic sense/ignorance people have...