Woodrow Wilson · 1913-1921 term
Supreme Court strikes down Oklahoma's grandfather clause in Guinn v. United States
In Guinn v. United States, the Supreme Court held that Oklahoma's grandfather-clause voting provision violated the Fifteenth Amendment, invalidating that mechanism of racial disfranchisement while recognizing that literacy tests, considered on their own, remained within state power.
Latest reviewed action recorded: Jun 21, 1915
Why this is mixed
Mixed records should not be read as simply positive or negative.
Gains
The decision invalidated Oklahoma's grandfather-clause suffrage amendment, while leaving open the continued use of literacy tests apart from that clause.
Limits
The ruling removed one explicit mechanism used to disfranchise Black voters, but it did not eliminate other restrictive voting barriers, so its practical protection for Black enfranchisement was important yet limited.
Record Note
Structured historical court-decision import. Sources are attached only to action and outcome records.
Original Promise
In Guinn v. United States, the Supreme Court held that Oklahoma's grandfather-clause voting provision violated the Fifteenth Amendment, invalidating that mechanism of racial disfranchisement while recognizing that literacy tests, considered on their own, remained within state power.
Action Timeline
Actions document what the federal government did. Outcomes below describe what changed, and each source list shows where the public record comes from.
Jun 21, 1915
Supreme Court decides Guinn v. United States
The Supreme Court held Oklahoma's grandfather clause unconstitutional under the Fifteenth Amendment and treated the suffrage amendment as invalid because the unconstitutional clause was not separable from the remainder.
Outcomes
Outcomes are the part of the record that can contribute to public scoring. They stay visible here with impact direction and linked sources so readers can verify what shaped the record.
Voting Outcome
The decision invalidated Oklahoma's grandfather-clause suffrage amendment, while leaving open the continued use of literacy tests apart from that clause.
Measured or documented impact: The decision invalidated Oklahoma's grandfather-clause suffrage amendment, while leaving open the continued use of literacy tests apart from that clause.
Black community impact: The ruling removed one explicit mechanism used to disfranchise Black voters, but it did not eliminate other restrictive voting barriers, so its practical protection for Black enfranchisement was important yet limited.
Evidence strength: Strong
Linked sources: 2
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