I’m writing with the caveat that what follows is not necessarily what Turtledove himself imagined, but I’d the case in TTL. My reply will be divided into multiple parts.
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The analogue in TTL to Tex Avery was Frederick Avery, born on a slightly different date in comparison to our world. He cans of age during the defeat of the CSA in the First Great War, the crises of the interwar years, and the rise of the Freedom Party. He joined the CS Army before the Second Great War, and was killed in combat in Ohio during Operation Blackbeard.
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The analogue in TTL to Walter Lantz, of the same name, was born on a slightly different date in comparison to our world. He never developed an interest in art. He joined the US Army in 1917, but the First Great War ended before he could see combat. He spent the rest of his life working in New Rochelle, New York, except during the Second Great War, when he found work in a barrel manufacturing plant.
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Jay Ward doesn’t exist.
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The analogue in TTL to Max Fleischer, of the same name, was born on a slightly different date in comparison to our world. His family, as in our world, immigrated to the United States from the Austro-Hungarian Empire. Unlike in our world, Fleischer’s father did not lose his business as a tailor for earthly clients, and he grew up in a comfortable household. Fleischer earned a law degree, and spent the rest of his life in New York City as a lawyer specializing in maritime law.