First, look up the differences between communism and socialism
Second, look into the socialist countries that are doing well... Sweden, Norway, Denmark, most of Europe, etc
Third, name a capitalist country besides America
Fourth, America is in the shitter right now, and dragging the whole world down with it... America is most definitely not doing well... I'd go so far as to say America is fucked and another recession/depression is about to smash us in the face again
This is mainly due to the inherent corruption in the capitalist system... it's not a good system at all... it breeds corruption and the most corrupt will always end up with all the money... this is why 50% of the world's money is held by only 63 people
It is no secret the USA is in a depression right now, but capitalism and socialism/communism are just two sides of the same corrupt coin, both sides run by bankers. I might add that a large part of the reason the USA is failing economically right now is its more recent turn towards socialism. Capitalism is designed to build up capital while communism/socialism is designed to strip that wealth and tear down societies. It is just a global system of controlled opposition. Red vs blue, republican vs democrat, capitalism vs communism, only on a global scale. Just look at the soviet flag, it is composed of two ancient symbols, the hammer and the sickle. The hammer represents building society up, and the sickle represents tearing it down. It is right in your face. The Federal Reserve Bank even funded The Soviet Union for many years as Russia went bankrupt some time in the late 1800's. As far as socialism and communism being different, this is a lie because socialism is designed to segway the target society into communism. Read some of the writings of Lenin where he clearly describes it as such.
Capitalism > Democracy > Socialism > Communism > Repeat
Both sides are equally corrupt. The benefits of socialism/communism are short lived and end in the society consumes itself once there are no more people left to rob, just like cancer. Also don't fool yourself, America is not the only country in the shitter right now economically speaking, and you can not truthfully put the entire blame for this on the USA. USA does not have a monopoly on corruption. Additionally there are PLENTY of other capitalist nations, your implication that there aren't is asinine. Also China is very clearly a capitalist state even if they still harbor some communistic tendencies. The only difference is the capitalism is under control of the state. The state is not your friend no matter where you reside or what ideology you support.
As far as Europe doing well, I beg to differ. It's socialist tendencies are what is driving the massive immigration influx, and frankly Europe can not defend itself from the on coming onslaught coming down upon it, especially since most of Europe bans the private ownership of firearms. This leaves most of its residents defenseless against the radical militants which make up the majority of the so called "refugees", most of which are fighting age males not even from Syria. The welfare state in Europe is very clearly what is motivating this massive wave of immigration, in addition to militant goals of jihadist conquest.
In conclusion, both "sides" of this ideological conflict are corrupt and just two faces of the same bankster elite. However, given that capitalism is at least focused on the creation of wealth and keeps all the services we all depend on functioning, it seems to me that this is the better choice of two evils at the moment until things can be changed or reformed. Socialism and communism gives zero incentive to people to actually work and provide services resulting in societal decay at a much more rapid pace. Don't be sucked into this US vs THEM controlled opposition Hegelian dialectic. Ultimately both are losing strategies and tools of the elite.