whereupon
From Longman Dictionary of Contemporary Englishwhereuponwhere‧u‧pon /ˌweərəˈpɒn $ ˈwerəpɑːn, -pɒːn/ conjunction IMMEDIATELYRESULT formal used when something happens immediately after something else, or as a result of something happening She refused to hand over her money, whereupon there was a fight.Examples from the Corpuswhereupon• The rioters headed downtown, whereupon they attacked city hall.