two questions about Slavery in the US

[Non_Comformist]

Question 1: If you were given the power to alter history and make it so that the US never used slavery would you? why or why not?

Question 2: How different would the US be today if slavery had never been used?
Things to cover:
Race relations
economic affects
role of blacks in America
Africa and carribean nations
the South
the North
polictics and the parties
sports

Stipulation: I want only to cover the slavery of blacks and not things like indentured servents or other forms.