Sonar was used widely in World War II in an effort to locate enemy submarines. It wasn't as sophisticated as it is today, but it did help. Actual numbers are difficult to come by, but sonar was effective in the successful attacks on several submarines.
take jobs that men had held before the war
Help with the American war effort
The US helped France in world war 1 with submarines in the Atlantic.
encourage women to work outside of the home to help the war effort.
No. It was a nationwide effort.
state which war
the political cartoons helped the WWII war effort by raising morale and also by encouraging civilians to help the war effort.
i dont know someone help
It didn't..
No, not really, submarines were first used successfully in the Civil War.
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