THEREUPON
Etymology
Adverb
thereupon (not comparable)
Upon that; thereon.
In consequence, or by reason, of that; therefore.
Following that; forthwith; in sequence, but not necessarily in consequence.
Source: Wiktionary
There`up*on", adv.
1. Upon that or this; thereon. "They shall feed thereupon." Zeph. ii.
7.
2. On account, or in consequence, of that; therefore.
[He] hopes to find you forward, . . . And thereupon he sends you this
good news. Shak.
3. Immediately; at once; without delay.
Source: Webster’s Unabridged Dictionary 1913 Edition