OK, so Congress does have the authority to collect taxes, and they have the authority to collect taxes on incomes, and they do not need to pay any attention to the number of people in any particular state nor apportion the taxes among the states. But it is still necessary that all taxes be uniform throughout the United States. Someone please correct me if my reading of that is faulty. I found this website today, and it breaks down the federal income taxes into an "effective tax rate" by state. And do you know what? The federal income tax is nothing like uniform throughout the United States. The people of some states pay as little as 11% effective tax rate, while the people of others pay 15% or even 17%. The Supreme Court has ruled in the past that de facto segregation counts just the same as de jure segregation. Since the effective federal income tax rate is so drastically different on people in different areas, does it violate the Constitution's requirement that taxes be uniform throughout the US, or is this just a happenstance with no real violation of the rights of individual people?