Why were literacy tests an effective way to prevent African Americans from voting? They had to pay a tax in order to vote.
They weren't allowed to use the grandfather clause.
Most of them still spoke a language other than English.
Most of them weren't able to read and write.

they protect against unsafe foods and medicines being sold

explanation:

protectionism fosters competition and keeps price regulated is not an argument in favor of protectionism.

answer; ecological fallacy;

an important point to remember about correlation is that while there is a _statistical_ relationship correlation does not equal _causation_

the first answer is: statistical

the second answer is: causation