Question: Who started a conflict by overthrowing Idi Amin?
Paraphrase: Who begun a struggle by ousting Idi Amin?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q48231 wdt:P607 ?obj . ?obj wdt:P31 wd:Q45382 } 
Answer: 1971 Ugandan coup d'état