I don't know why people says "America" when they have to say "United States".

America is North America, South America, and Central America.

Can you  explain me?

Just as with any country there are good and bad people. My main problem is that here in the US the people that get most of the attention seem to be the bad people and for some reason they appear to be portrayed as the mould we should all be shaped from. Of course, this is not entirely true, but appearances can do a lot of harm if care isn't taken. The English language is difficult for those that want learn it, but then any language is difficult if you don't know it. Some people have an easier time of language learning than do others, but it is all just a matter of effort.

The USA is a normal country that at the moment is the most powerful country all over the world.

People are normal but sometimes some people put on airs about power of the USA.

American English is not so beautiful as British English in context of pronunciation and beauty of style. To hear American English is not a pleasure compared to British.

The USA likes to hamper in affairs of other countries sometimes with positive effects sometimes with negative ones.

I am sure that success of the USA at the moment is linked more with the present system of organization of the USA than the qualitative aspects of population.

On the whole the USA brings positive moments in the world at the moment.

i have been in U.S for nearly two years(i am an exchange student) and i think honestly it's 50-50 but that is just my opinion.English is a very diffuclt language to learn but so is any language as long as you put effort in learning it you will soon understand and speak it.