There were more than 100 million killed just in WWII, by guns and other means. At 25 thousand deaths by gun in the US a year it would take 4000 years to equal that target.
“... more than 100 million killed in WWII ...”
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I don’t think so.
You might have an error in your figure. On a world wide scale, the last estimate I saw of deaths caused by WWII was about 50 million. In 1940 the estimated population of the United States was 132 million. Since we are writing about deaths in the United States, The United States could not have lost 100 million killed in WWII.