Which of these statements is true about the history of voting in the United States?

a.
Political Parties have a long history of voting suppression, against particular groups, to ensur that their candidates will get elected.

b.
The Federal government has always been very aggressive in taking measures to ensure that all citizens will have the right to vote.

c.
Women in the US won the right to vote in 1828.

d.
The poll tax only affected poor white voters in the South.