The purpose of this legislation is to update existing laws regarding land leasing for specific Native American tribes. It aims to allow the Mashpee Wampanoag Tribe and the Wampanoag Tribe of Gay Head (Aquinnah) to lease their land for longer periods, specifically up to 99 years. This change is intended to provide these tribes with greater flexibility and security in managing their land for various uses, including economic development. The key provision of this law is the amendment to the Long-Term Leasing Act of 1955.