Should the united states replace its progressive income tax system with a proportional(aka flat tax) or regresive (sales) tax)?

 Research topic proposal due. Turn in one or two typed pages in MLA format, with a paragraph explaining each of the following: The main problem or issue; your starting central viewpoint or thesis, with a brief overview of supporting arguments (no evidence required yet); your reason why this issue is important and why it is relevant to your audience.