The main purpose of this legislation is to mandate that the national motto of the United States, "In God We Trust," be displayed or inscribed on all federal buildings. The objective is to promote a sense of national identity and pride by ensuring that this motto is visible in public spaces associated with the federal government. Key provisions of the legislation include a requirement for the Administrator of General Services to ensure that the national motto is prominently displayed in every federal building within one year of the law's enactment.