What economic opportunity and freedom are you talking about exactly? Please give relevant examples that are true today and not 50 years ago.
The US export economy is currently mostly about exporting genetically modified soy and weapons. While the main export product in terms of money spent obviously is war, the USA is doing this at a loss, so it doesn't count. Software and IT services are an export product, but the money made from that is rapidly decreasing and in fact, due to taxes, is not in fact made or stored in the USA and does not benefit it's economy.
The internal economy is mostly centred around flipping burgers in fast food restaurants, producing marijuana (most profitable crop in the USA), waitressing and lawsuits over copyrights. While tax brackets for high income are slightly favourable compared to a lot of other "first world countries" the chance of actually making that much money is much lower in the USA than in most other "first world" countries.
The USA is currently importing most of it's (high) tech, clothing and most other mass manufactured products apart from about half of it's food. They are spending more money on things going abroad than they are making selling stuff abroad. In terms of US dollar value that may not look bad, but if you look at the amount of foreign currency spent and made, the USA is getting poor rapidly. This may mean that at higher poverty rates some plans that wouldn't work in a rich country suddenly are feasible and may count as an "economic opportunity", but apart from a few exceptions, nobody in the USA will have a fighting chance to benefit from this.
The USA is actually rather low on most rankings of things like press freedom, human rights organizations and such. Also, the USA has one of the highest percentages of their population in a stereotypical location for the anti-definition of free, in jail. Your definition of free may very well be rather unique compared to that of the rest of the world, or you haven't yet looked at how your definition of free would hold up in other countries.
Typical freedom arguments like "the right to bear arms" apply to a lot more countries than most Americans are aware of and are in general not required if you have a government and law enforcement that you can actually trust.
There is one USA freedom that I would actually really would like to see happening in Europe: The right to be forgotten. With all my metadata being stored by the USA government, I really doubt that the USA is taking that right seriously themselves, so I guess the value of that right isn't what it used to be....