Question: When were 1000 dollar bills taken out of circulation?
Disambiguated questions and answers: question: When were 1000 dollar bills no longer being issued?
When, if ever, were 1000 dollar bills taken out of circulation?
answer: July 14, 1969
July 14, 1969 (Monday)
still legal tender
Natural Questions answer: July 14 , 1969 (from the Wikipedia article "Large denominations of United States currency")