What system has authority over all federal law ?

Why does the united states constitution require that a national census be taken every ten years?

Rational ignorance suggests that a. voters are ignorant on issues that are not of special interest to them b. voters do not pursue information about issues before voting c. low voter turnout is due to a lack of understanding of the platforms of each political party d. voters are uninterested in the electoral process

What is the term for the right to vote in elections?