Hawaiian citizens voted overwhelmingly (93%) to join the USA. It was accordingly added as the 50th American state in 1959. The United Nations recognized this as legal under international law by removing Hawaii for the list of non self-governing territories. | Hawaiian citizens voted overwhelmingly (93%) to join the USA. It was accordingly added as the 50th American state in 1959. The United Nations recognized this as legal under international law by removing Hawaii for the list of non self-governing territories. |