Explain how the progressive income tax system works

They guarantee income equality.  Social Justice. And government revenue.

I'm not quite sure if this is what you're looking for but I hope it helps at least a little bit.

The correct answer is connotation.

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.