I know I am late with this reply but my real life was more important.
Argument of Lateralus stands if you don't think outside the box. I admit that I could be wrong but I could be also right.
In the US there is about 3 children per family on average in Europe it is about 1.5. That means that Europe has next generation it is just that it is smaller then the last one.
So that means that US will have to create jobs for all those people while Europe will be getting older. But there is a factor of modern technology here.
High-tech industry actually needs small amount of people since machines are building machines that create goods.
Which could probably have better quality and be produced faster.
But USA will not be able to do substitution fully because people need those jobs.
Only things you need in modern industry is few guys to repair the system and few people to do the paper work.
I think that all of us can agree that in the future there will be some problems with the amount of resources. So not having to many children could be advantage in the end.
Because of this EU could get large advantage over the USA which will need to employ people, build new houses for them, new infrastructure to support them, and produce more of everything for those new people.
Also there are more things that are based on cultural and social differences.
European societies function on the different way, for example there is a huge population in the USA that thinks that government should stay away from many things while in Europe it is normal that government gives more help to economy.
One more thing is that Europeans are not fat as people in the US. Once all those people who lived in fast food culture get older they will have huge health problems and if a lot of people have this problem entire society has a problem.
Level of idiocracy is much lower in Europe then in US what in the end means that society is much stabile from the inside.
There is no prison culture so we save a lot of resources when it comes to justice system.
USA has about 750 prisoners on 100 000 people while European average is about 100-130.
If you ask me that is because of bad education (by this I mean too narrow point of view), prison culture and the fact that people can't find job.
What is again linked to having too many children.
There is also war of the ideas which US is losing for years.
By this I mean scientific level.
In the USA there are strong anti-science agenda in government and general public. It doesn't need to be anti-science, lack of interests or the most basic knowledge can be equally deadly.
Many pro-something activists always celebrate when they manage to stop some experiment or some controversial law.
But what really happens is that the experiment is done two months later in Europe so the Europe is doing the progress in the scientific area.
As researching are going forward the experiments are going more are more controversial and less likely to supported by US public. But there is a catch, many of that experiments are vital for the advance of medicine. The scenario is taking USA in difficult position because it could become totally depended upon USE because no one did the progress and if it happens that the relations become hostile it could happen that USA will stay without modern medical care.
Good medicine can make huge difference in many ways. For example it is not the same if your large old population is healthy or sick.
In the end some of that means that some disease of 21 century could wipe out large amount of USA population because there is not proper health care. Not to mention the possibility of the bio attack (maybe even from Europe)
It is not impossible that there will be hostile atmosphere between the two because of how public thinks/acts and the divide of Religion/Science.
For example I can even take my future profession as one example of this.
I am geology student, from what I know my colleague on the south of USA and mid-west can't learn what I can.
That is because modern geology is in direct collision with the Bible.
The point of this little story is that if USA does not start to work on progressive thinking it will find itself in serious problems.