After the ROC participated in the Osaka World Expo in 1970, it gradually left or was removed from various organizations, including the United Nations. Foreign relations grew more and more difficult, and mainland China actively tried to block Taiwanese participation, opposing the issuance of invitations to Taiwan.
而我國在 1970 年參與大阪博覽會後即陸續退出聯合國等國際組織，外交處境日益艱難，加上歷屆世博主辦國礙於中國阻撓，通常不願邀請我國參加。