United Nations Association of the United States of America | 5,460 followers on LinkedIn. The United Nations Association of the United States of America (UNA-USA) is a membership organization dedicated to inform, inspire, and mobilize the American people to support the ideals and vital work of the United Nations. For 70 years UNA-USA has worked to accomplish its mission through its national network of Chapters, youth engagement, advocacy efforts, education programs, and public events. UNA-USA is a program of the United Nations Foundation.