What event doubled the number of eligible voters in the United States in 1919?
a.
The voting age was lowered to 21.
b.
African Americans were given the right to vote.
c.
Women were given suffrage.
d.
A wave of immigrants came to the United States from Ireland.

C. Women were given suffrage/voting rights

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.

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