I am in a contest and I need your help!
 The city was Laramie. The woman was seventy. And with what she
elected to do, the country was changed forever. Who was she and what
did she do?

On September 6, 1870, Mrs. Louisa Swain of Laramie became the first
woman in the United States to cast a vote in a government election.
She was seventy years old.
http://lariat.lariat.org/LWV/lwvlarm.html


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Laramie was the first town to hold a municipal election, on September
6, 1870. So, the first woman who voted in the United States was a
Laramie resident; she is believed to be seventy-year-old Mrs. Louisa
Swain.

History of The City Of Laramie
http://www.laramiemuseum.org/LaramieHistory.html


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Laramie was also the site for the first equal suffrage vote cast in
the nation by a woman- Mrs. Louisa Swain on September 6, 1870.

Ladder Ranch Company 
http://www.wyoranch.com/history_wyo.html


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The first American woman to cast a legal vote, along with about 1000
other women, was Mrs. Louisa Swain of Laramie, Wyoming.
http://www.morristown.org/1800s.htm


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First Woman to Vote, September 6, 1870
Louisa Swain, Laramie, Wyoming Territory

Wyoming Public Television
http://www.wyoptv.org/programming/wyomingperspectives/wyomingwomen/


Search terms used:
Laramie woman was seventy
Laramie woman " Louisa Swain"


I hope this helps!

Best regards,
Bobbie7

thank you so much i think your answer was right on