Disenfranchisement occurs when people try to prevent other certain people from being able to vote. This is done through intimidation, violent acts, or unreasonable requirements on people to register to vote. In America an examples of disenfranchisement is the disenfranchisement of blacks.
In the U.S. people had put insane requirements on blacks to be able to vote and the KKK was also another way of keeping blacks from voting. When black people weren't allowed to vote, they stood up for themselves and it took them decades of protesting to be able to vote.
The government would demonstrate disenfranchisement when they would make the requirements for voting ridiculous. Most of the disenfranchisement that has happened in American history has happened in the last 150 years. Even though some people were strongly against blacks being able to vote in the U.S, eventually they gave up and the people were finally able to vote just like everyone else and their vote counted just as much as a white male's vote.