This bill amends a 1955 federal law to allow the Mashpee Wampanoag Tribe and the Wampanoag Tribe of Gay Head (Aquinnah) to lease their tribal lands for up to 99 years. Currently, these two federally recognized tribes in Massachusetts have more restrictive leasing rules than other tribes covered under the Long-Term Leasing Act. By adding these tribes to the law's provisions, the bill would give them greater flexibility to lease land held in trust by the federal government, which could help them generate revenue and pursue economic development opportunities. The bill does not specify any new funding or implementation timeline beyond the legislative amendment itself.