The “NA” in E-USAs old name ELNA means “North America”. Did ELNA cover all of North America or just the United States?
The “North America” was included in the name when ELNA’s predecessor organization, the Esperanto Association of North America, was founded almost a hundred years ago, and was retained in the name of the current organization for the sake of continuity and to avoid bureaucratic problems involved with changing the name, until it was decided to officially change from ELNA to Esperanto-USA in 2007. Esperanto-USA, though it has a few members in other parts of the continent, represents the United States; there are separate organizations in Canada (Canadian Esperanto Association) and Mexico (Mexican Esperanto Federation) to represent those countries, as well as a few smaller local organizations in Central America. You can join E-USA on-line by credit card from E-USA’s online store.