Why was An Inspector Calls written in 1944?

it was set in 1912 because that's when the upper classes and lower classes were divided the most, it was only 2 years before the WWI and poor women were counted as cheap labour when the rich had nothing else to do than to marry in their early twentys. it was written in 1945 because preistley was afraid that this would all come back when after the war women had better jobs and the division was much smaller than before so he was trying to show the audience how important the socialism is.