8 WATSON v. REPUBLICAN NATIONAL COMMITTEE Opinion of the Court interpretation “that courts do not interpret statutes in isolation, but in the context of the corpus juris of which they are a part, including later-enacted statutes.” Branch v. Smith, 538 U. S. 254, 281 (2003) (plurality opinion). And UOCAVA confirms that while Congress has set the date by which absentee ballots must be cast, States have the power to set the date by which they must be received. UOCAVA requires States to permit absent military and overseas voters to cast absentee ballots in federal elections. 52 U. S. C. §20302(a)(1). As a backup, it establishes a federal absentee voting system. In detailing this system, UOCAVA repeatedly presupposes that ballot receipt is a matter of state law. For example, it specifies that a federal absentee ballot shall not be valid if the State provides an absentee ballot “at least 60 days before the deadline for receipt of the State ballot under State law.” §20303(e)(2). It also mandates that the ballots of overseas military voters be delivered “to the appropriate election officials” “not later than the date by which an absentee ballot must be received in order to be counted in the election.” §20304(b)(1). Finally, to avoid any double counting, UOCAVA provides that federal absentee ballots “shall not be counted” if a State receives the voter’s state absentee ballot by “the deadline for receipt of [that] ballot under State law.” §20303(b)(3). If the election-day statutes established a nationwide ballotreceipt deadline, these references to state ballot-receipt deadlines would make little sense. Finally, this interpretation of the election-day statutes is consistent with the way the Constitution treats elections. Although most voting in our country’s early days occurred in person—making casting and receipt simultaneous—that was not true of the electoral college. For that, the Constitution establishes a system somewhat analogous to absentee voting: Presidential electors “shall meet in their respective States, and vote by Ballot,” and then “transmit” their votes to the “Seat of the Government of the United States,