This legislation mandates the creation of a Semiquincentennial Congressional Time Capsule by the Architect of the Capitol to commemorate the 250th anniversary of the United States. The contents will be jointly determined by the Speaker and Minority Leader of the House, and the Majority and Minority Leaders of the Senate, and must include a joint letter from these offices. All items placed within the capsule must be made of durable materials that pose a low risk of degradation, such as metal or archival paper, and cannot exceed specified dimensions. The Architect of the Capitol will prepare the capsule for sealing and burial in the Capitol Visitor Center on or before July 4, 2026 , with the location requiring approval from relevant congressional committees. The time capsule is designed to remain sealed for 250 years, until July 4, 2276 . On that date, the Speaker of the House and the Majority Leader of the Senate will present it to the 244th Congress, which will then determine how to preserve or use its historical contents.