California and Nevada voters will decide in November if they want to ban forced prison labor by removing language from their state constitutions rooted in the legacy of chattel slavery.

Nevada incarcerates about 10,000 people. All prisoners in the state are required to work or be in vocational training for 40 hours each week, unless they have a medical exemption. Some of them make as little as 35 cents hourly.

Voters will weigh the proposals during one of the most historic elections in modern history, said Jamilia Land, an advocate with the Abolish Slavery National Network who has spent years trying to get the California measure passed.

“California, as well as Nevada, has an opportunity to end legalized, constitutional slavery within our states, in its entirety, while at the same time we have the first Black woman running for president,” she said of Vice President Kamala Harris’ historic bid as the first Black and Asian American woman to earn a major party’s nomination for the nation’s highest office.