Fail to see how your questions are related, but..

1 - I'm not going to try to explain 'how' this has happened - but if you do a google search you can find out a lot of useful information about how inequalities have arisen.

2 - It is true that life is often horribly unfair. However, we sitting here, contemplating these things, have choices, even if they may be limited due to circumstance. We can choose to make the best of what opportunities we do have.