There is a glut of capital and a deficiency of demand from US workers due to weak spending power. Was not the obvious solution posed by Keynes? Did not Keynes

There is a glut of capital and a deficiency of demand from US workers due to weak spending power. Was not the obvious solution posed by Keynes? Did not Keynes work quite well after Roosevelt's partialy successful timid attempts at it were forced into enormous government demand by WWII?