From the ACLU:

Voter ID laws deprive many voters of their right to vote, reduce participation, and stand in direct opposition to our country’s trend of including more Americans in the democratic process. Many Americans do not have one of the forms of identification states acceptable for voting. These voters are disproportionately low-income, racial and ethnic minorities, the elderly, and people with disabilities. Such voters more frequently have difficulty obtaining ID, because they cannot afford or cannot obtain the underlying documents that are a prerequisite to obtaining government-issued photo ID card.

Voter ID Laws Deprive Many Americans of the Right to Vote

• Millions of Americans Lack ID. 11% of U.S. citizens – or more than 21 million Americans – do not have government-issued photo identification.

• Obtaining ID Costs Money. Even if ID is offered for free, voters must incur numerous costs (such as paying for birth certificates) to apply for a government-issued ID.

• Underlying documents required to obtain ID cost money, a significant expense for lower-income Americans. The combined cost of document fees, travel expenses and waiting time are estimated to range from $75 to $175.

• The travel required is often a major burden on people with disabilities, the elderly, or those in rural areas without access to a car or public transportation. In Texas, some people in rural areas must travel approximately 170 miles to reach the nearest ID office.

• Voter ID Laws Reduce Voter Turnout. A 2014 GAO study found that strict photo ID laws reduce turnout by 2-3 percentage points, which can translate into tens of thousands of votes lost in a single state.

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Continue reading about how Voted ID laws are discriminatory: https://www.aclu.org/other/oppose-voter-id-legislation-fact-sheet