whereupon
1. [ conjunction ] coordinating conjunction, at which time or place
2. [ adverb ] upon which
Examples:

"the rock whereupon she stood"

3. [ adverb ] closely following and in consequence of which
Examples:

"the Japanese refused to import U.S. made cellular phones whereupon the U.S. imposed strict tariffs on Japanese exports"

4. [ adverb ] in consequence of which
Synonyms: whereat
Examples:

"this is a statement whereat the listeners may get angry"