Who is affected and how:

• Federal agencies (Department of the Interior, National Park Service, Bureau of Land Management): Must manage newly designated areas under a short, defined timeline and coordinate quickly with Congress and stakeholders; planning, protections, land management rules, and resource commitments may be temporary unless Congress acts.

• Indian Tribes (tribal governments): Tribal cultural sites, treaty-protected resources, and co-management arrangements that sometimes accompany monument designations may face uncertainty if a designation is not affirmed by Congress; tribal consultation and long-term protections could be disrupted.

• Local communities (including towns and counties near designated lands): Communities that would expect economic changes (for example, tourism or recreation increases) or land-use restrictions tied to monument status may see benefits or limits for only a short period unless Congress makes the designation permanent.

• Mining, energy, and infrastructure project operators: Industries seeking access to federal lands for extraction or development may gain an opportunity if a designation lapses, but will face a 25-year prohibition on re-listing the same lands as a monument if Congress rejects the original designation.

• Tourism industry and outdoor recreation businesses: Local businesses that benefit from monument-related visitation could face uncertainty about the durability of those benefits if a designation expires.

Overall effects: The bill reduces the durability of executive-only national monument designations, increases congressional control and oversight, creates short-term administrative burdens for federal agencies, and raises long-term access implications for both conservation interests and resource users. It may produce legal and political contests over designations and could change how stakeholders and agencies approach monument proposals and management.