When is it? History of film noir

film noir was a genre in its prime in the 1940's-60's.
 Film Noir (literally 'black film or cinema') was coined by French film critics (first by Nino Frank in 1946) who noticed the trend of how 'dark', downbeat and black the looks and themes were of many American crime and detective films released in France to theatres following the war, such as The Maltese Falcon 1941, Murder, My Sweet (1944), Double Indemnity 1944, The Woman in the Window (1944), and Laura 1944. A wide range of films reflected the resultant tensions and insecurities of the time period, and counter-balanced the optimism of Hollywood's musicals and comedies. Fear, mistrust, bleakness, loss of innocence, despair and paranoia are readily evident in noir, reflecting the 'chilly' Cold War period when the threat of nuclear annihilation was ever-present. The criminal, violent, misogynistic, hard-boiled, or greedy perspectives of anti-heroes in film noir were a metaphoric symptom of society's evils, with a strong undercurrent of moral conflict, purposelessness and sense of injustice. There were rarely happy or optimistic endings in noirs.