Is alternative history possible?

I have been thinking the answer of this question since I started writing on this blog. If you have been reading me, you may be thinking that my answer is yes and you are correct, I say that it´s possible. Many things could have changed during all our history and our daily lifes wouldn´t be as we know nowadays. For instance, if Hitler had won the WW2, socially we would be different. We would discriminate many people and they would have a lot of poverty if we put the case that they weren´t killed. So my conclusion is that alternative history is possible and it would change our lifes.