Why was the twenty-first amendment to the us constitution necessary?

100 which of the six principles of the constitution is most impacted by gerrymandering? i need 2 paragraphs or else it will be reported.

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

According to the article, what did plato and aristotle have in common?