After a terrorist attack in Lagos, United Nations created the Sokovia Accords, wdocument for supervising the enhanced individuals. The United Nations passed the accords and arranged a formal ceremony at the Vienna International Centre in Austria.
Among those in attendance at the ceremony were Black Widow, King T'Chaka of Wakanda and his son, Prince T'Challa. T'Chaka opened the proceedings with the keynote address, citing Wakanda's involvement in Ultron's plan for global genocide and the recent destruction in Lagos as his reasons for supporting the accords.
T'Challa, who had been observing the speech, suddenly noticed a commotion outside the building and learned that a bomb had been planted in a news van. Despite his attempts to evacuate the room, the bomb planted by Helmut Zemo decimated the building. As chaos ensued, a wounded T'Challa found his father's corpse and cradled it in his arms. As the survivors regained consciousness and attempted to evacuate, journalist Jeffrey Mace helped free those who were trapped under rubble.
Some time after reclaiming Wakanda, T'Challa gave a speech at the United Nations in rebuilt Vienna International Centre, officially ending Wakanda's isolation.