Text: Today's conspiracism stems mainly from the instability of the late 1960s and early '70s--a period of both uncontrolled violence (assassinations, urban riots, political protests turned bloody) and anti-government ideology (the left challenged laws regulating speech, sex, and drug use; the right fought busing, the Warren court, and the welfare state).
Entailment: The 1960s and '70s saw many turbulent events.
Contradiction: World Peace was globally attained some time during the late 16th century.