Top 3 Nations that had the most impact on the world today

You've got to take into account that Britain had many beating bags for them (read the entire planet) xD

Maybe that's why they were one of the most successfull countries in the world? hmmmm...

Also the Muslim empires were very influential.

You mean the Arabian Caliphate that Mohammed started?
That one was very influential!!

Things like that, yes.

Rome - thanks to them Catholicism grew ever larger
British Empire - obvious, I hope
USA - helped stop the spread of communism and sped up globalization

britain was very influential i mean look at our well known former colonies
-USA world superpower
-Canada one of the best country to live, after the scandinavian countries
-India the worlds fastest growing economy
And then look at spain the other big coloniser. Which former territories include Cuba(nice country but run by a dictatorship), Mexico(infamous for its ongoing drug war which doesn't seem to ever make progess) and then Argentina(which was ruled by a miltary junta for a while and then invaded the falkland island which it has no rights to own and never will do)

Many things wrong in there.
1. Argentina had Falklands first
2. Canada has barely influenced the modern world
3. Indian Economy has, in no way, shape or form strongly changed the world today (But if you mean Indian as a nation that's debatable).

China just because they supply around 15% of the worlds population!!!

1.Argentina has at no point owned the falkland islands and besides the people of the falkland are happy to stay british
2.At any point did i say canada had influenced the world. i just said that it is good place to live in.
3.If your economy crashes and takes down several countries with it, does that mean countries like greece,portugal and spain have great economies.clear not.One of the signs of a good economy is decent and sustainable growth, besides india just going through the same building phase that china went through a while ago

No, that was Constantine fault, Most of Rome was pro pagan until they were forced to convert.

Economy is a FACTOR, but I mean, how did it make it so that Racism in the still US thrives or that Libya had a civil war?

And Canada does not Shape the world, sorry for assuming you meant influence. But Canada's existence hasn't changed world politics much, nothing wrong with them, but they the best so far is health care and leading the way in Multiculturalism, which still hasnt really shaped the world.

AHHH! Too much nationalism!!!!

FINALLY! Someone who agrees!

Byzantine Empire

Well Modern i would say
UK
America
Russia

But Anciant i would say
Roman -
Greek-
Arabian area in general

I agree, except I would put Rome and Greece together and add China under ancient.

I think this is just one of those thing where its too hard to post three when alot of nations have done so much to change the course of history.

Well you have to really think back if some of the ones you are thinking of are very similar and followed the model of even earlier nations, by then you have really narrowed it down.

The ajfkelajfelaflea Tribe and the ajfleajfle Tribe from -50 million BC whom fought eachother in South Africa.
It was some tribes back when Humanity was just starting out that shaped the world, not America or Rome.