Guinn v. United States
The Court ruled that Oklahoma's 1910 constitutional amendment, which excused voters from a literacy test if they or an ancestor could vote before 1866, violated the Fifteenth Amendment because it revived the very racial exclusion that Amendment was meant to erase.
Because the 1866 exemption was struck down, the literacy test it was tied to could not survive either, since the amendment's own wording made clear the two provisions were meant to work together — leaving Oklahoma's whole 'grandfather clause' scheme unenforceable.
How it got here: A federal appeals court certified two constitutional questions about the Oklahoma suffrage amendment to the Supreme Court before deciding the election officials' criminal appeal.
The Case in Depth
What happened
Oklahoma election officials were indicted for conspiring to stop Black citizens from voting in a 1910 general election. Oklahoma had adopted a constitutional amendment requiring a literacy test to vote, but exempting anyone whose ancestors could vote before January 1, 1866 — a date before slavery ended, meaning almost no Black Oklahomans could qualify for the exemption while many white residents could.
The question before the Court
Could Oklahoma let people skip a new literacy test for voting just because their ancestors could vote before 1866 — a cutoff that mainly helped white voters and excluded Black citizens?
Why it matters
Election officials could no longer use the 1866 cutoff to excuse some voters from Oklahoma's literacy test while requiring it of Black citizens whose ancestors had been enslaved and thus could not have voted before that date. The ruling protected the ability of Black voters to register and vote, and it also confirmed that election officials who deliberately used an unconstitutional voting rule to block voters on account of race could face federal criminal prosecution.
What changes now
The Court's answers went back to the lower federal court, which was considering the election officials' criminal appeal under the certificate procedure. With the grandfather clause and its literacy test declared unenforceable, Oklahoma could not use that suffrage amendment to justify excluding Black voters, and the criminal case against the election officials would proceed under that understanding of the law. This decision is a final resolution of the constitutional questions certified.
What this does not decide
The Court did not rule on the general power of states to set voting qualifications like literacy tests, and it said the literacy test itself was independently valid; it struck down only the 1866-based exemption and the literacy test's application to those the exemption covered, because of how the amendment's text linked them together.
How the Court got there
The legal reasoning, step by step
- The Court first established that while the Fifteenth Amendment does not itself grant a right to vote, it directly bars the United States or any state from denying or abridging voting rights on account of race, color, or previous condition of servitude, and this ban is self-executing, meaning it strikes down conflicting rules automatically without need for further legislation.
- The Court then asked whether Oklahoma's exemption for people who (or whose ancestors) could vote before January 1, 1866 was, in substance, just a way of restoring the racial exclusions the Fifteenth Amendment had already destroyed. It found no plausible reason for picking that particular date except to recreate pre-Amendment conditions, since 1866 predates the Fifteenth Amendment and tracks who was enslaved.
- Because the 1866 standard had no logical basis except reviving a racial voting bar, the Court held it void as a direct evasion of the Fifteenth Amendment's command, even though the provision never mentioned race explicitly.
- The Court then considered whether Oklahoma's separate literacy test — valid on its own as an ordinary exercise of state power over voting qualifications — could survive once the 1866 exemption was struck down. Normally, courts try to save the rest of a law when one part is invalidated.
- Here, though, the amendment's text tied the two provisions together so tightly that treating people covered by the void 1866 standard as still subject to the literacy test would contradict the amendment's plain purpose, so the literacy test could not be enforced against them either.
Doctrinal impact
Cases affected by this decision
Reaffirms Ex parte Yarbrough (110 U.S. 651)
Relied on as established doctrine that the Fifteenth Amendment can automatically expand suffrage by striking discriminatory clauses.
Reaffirms Neal v. Delaware (103 U.S. 370)
Cited alongside Yarbrough to support the self-executing effect of the Fifteenth Amendment on state suffrage laws.