You have a lot to learn.

To say that Canadians and Australians do not have their own culture is the most ridiculous thing you could say. How do you look up culture on the internet? Culture isn't defined, its expressed, and since you are not a part of either of them, it makes since that you wouldn't understand. I would advise you to never say that again, it makes you sound inedible naive.

Of course every country has good and bad things about it. Everyone is entitled to their own opinion. However, you are also being naive if you think that the US does not benefit from other countries as well. Who do you think makes all of those fabulous Nike shoes?

You can sit here and say our music is the most popular in the world because you live in the US. Of course that will be what you're exposed to most.

I could go on and on about how your opinion makes no sense, however it would be a waste of time, and as I said before everyone is entitled to their own opinion.