Prior to the 1970s, how often did voters have to register to vote?

a. every 5 years

b. only if they moved

c. every 10 years

d. yearly

The voters in the United States has to register yearly in order to vote before 1970s.

Answer : Option D

Explanation:

Registration of voters was based on yearly basis in order to cast a vote for the election in favor of their elective representatives. The voter registration had many criteria which needed to be fulfilled such as residential eligibility, literacy test to be passed, minimum age eligibility and others.

Of all these criterion, minimum age eligibility was changed several times with the amendments adopted, presently which is minimum of 18 years of age. The residential eligibility for the resident to be residing for a particular period of time was change and the literacy test was omitted by the amendments made hereafter the 1970s.