In what case did the Supreme Court address the issue of one person, one vote regarding legislative districts?

The Supreme Court case that specifically addressed the principle of "one person, one vote" in the context of legislative districts is Baker v. Carr. This landmark decision established that redistricting issues are justiciable, meaning they can be decided by the courts, and it was pivotal in ensuring that legislative representation was fairly distributed according to population. The Court ruled that states are required to draw legislative districts in a way that each individual's vote carries roughly the same weight, thereby reinforcing the principle of equal representation. This case set a significant precedent for subsequent rulings regarding apportionment and the drawing of district lines, ultimately impacting how elections are conducted and how representatives are elected in the United States.