Oscar reflects on how Hollywood changed as the prospect of America entering the Second World War loomed over the country. Many pro-interventionist voices worked in Hollywood, so did their part in reflecting the attitudes of public in their stories. After Pearl Harbour, President Roosevelt realised the power movies can have to entertain and inform audiences who saw them, and demanded less censorship so Hollywood could integrate war themes into its stories.

See how America's changing stance to the war is reflected in three Best Picture winners:

How Green Was My Valley - portraying the impeding loss of America's youth

Mrs Miniver - showing British efforts on the home front, in need of support

Casablanca - reinterpreting America's delayed action as a noble effort

Oscar takes a look back at the development of colour film, particularly the rise of the name most synonymous early Hollywood colour films - Technicolor - and the establishment of 'colour consciousness' thanks to Natalie Kalmus.

Learn how 'Gone with the Wind' used colour symbolism to direct the attention of the viewer, emphasise emotional moments, and create narrative closure on the road to becoming (still!) the most successful Hollywood film ever made.