Which case applied the one-person, one-vote principle to U.S. House districts?

The case that applied the one-person, one-vote principle to U.S. House districts is Wesberry v. Sanders. This landmark decision was made in 1964 and addressed the apportionment of congressional districts. The Supreme Court ruled that each congressional district must have roughly equal populations to ensure that each person's vote carries the same weight in elections. This principle aimed to eliminate disparities in representation that occurred when districts had unequal populations, leading to some votes having more influence than others.

Wesberry v. Sanders built upon earlier cases, particularly Baker v. Carr, which dealt more broadly with the apportionment of state legislative districts and established the principle of equal representation. However, it was Wesberry that specifically focused on the House of Representatives, affirming the requirement for equality in the population of districts as mandated by the Constitution. The other cases listed, such as Roe v. Wade and Griswold v. Connecticut, pertain to issues of privacy and reproductive rights, and are not relevant to apportionment or electoral equality.