In what way did ww2 increase domestic work opportunities for minories

Women, besides being placed in more skilled jobs than they were used to in non-war times (and even World War I when they participated as typists, secretaries and even overseas functions like nurses): as mechanics, engeneers, reseachers, eletricians.
In 1942 the Women's Army Corps was created, and women were sent overseas to combatant fields (though they would not be involved in direct fighting, they served in functions like being pilots). The Navy and Coast Guard also had all-women troops, as did the British Army.
In 1940 the Select Service Act was passed and African-Americas could enlist in all branches of the Armed Forces, composing finally 11% of the manpower, regardless of the discrimination that still was directed to them.
Thousands of Hispanics also fought on the war, Mexican and Puerto Ricans mainly.
At least 33,000 Japanese-americans participated in the war, too. They had the most decorated unit in US history, when after 1943 they won the right to enlist (discrimination as a result of the Pearl Harbor offence kept them from being able to volunteer before).