Thereupon
/ˌðerəˈpɑːn/
Definition 1 of 1
Pro Tip 1/3Sequence Marker
Use 'thereupon' to indicate the next action in a sequence of events. 
She accepted the award, and thereupon gave a moving speech.
Pro Tip 2/3Quaint Feel
'Thereupon' can give a sentence an old-fashioned or formal tone. 
The jury gave their verdict, and thereupon the judge passed sentence.
Pro Tip 3/3Legal Usage
'Thereupon' is often used in legal or official contexts to denote immediate consequence. 
The decree was signed, and thereupon it became law.