In 1915, in ''Guinn v. U.S.'', the U.S. Supreme Court helped African Americans by striking down "grandfather clauses" that interfered with voting by descendants of slaves. The Court based its ruling on the 15th Amendment, which guarantees the right to vote regardless of "race, color, or previous condition of servitude." In other words, the 15th Amendment prohibited interfering with the rights of former slaves to vote. | In 1915, in ''Guinn v. U.S.'', the U.S. Supreme Court helped African Americans by striking down "grandfather clauses" that interfered with voting by descendants of slaves. The Court based its ruling on the 15th Amendment, which guarantees the right to vote regardless of "race, color, or previous condition of servitude." In other words, the 15th Amendment prohibited interfering with the rights of former slaves to vote. |