Do you believe that someday humanity will be United into am Earth Federation?

I don't think this will happen unless of course China decides to take over the world and then we could have a world governement with no freedoms and that would suck so anyway I don't think it would happen becaues of the fact that the worlds nations each would want to rule the world still unless the U.N did it and the people all around the world agreed on it.

Not a chance in hell. You will always find some faction who believe their ways are best or that you are undermining them or you are forcing people to follow. The world is too vast its too populated and it brings too much selfishness as most of us put ourselves first before we put other people. Until empathy can be gained by everyone we will never have a united earth which is shame because together I am sure we can save more lives and end more poverty and starvation.