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to answer my own question, i have two guesses as to why root beer companies often make cream soda as well.
1. a company is specializing in old-fashioned flavors. This would explain companies like Stewart's and IBC, who make flavors like root beer, cream soda, cherry-vanilla, etc.
2. Ice cream floats are made with root beer. it may be that root beer ice-cream floats were the standard, and so the two became linked. I have no proof of this though.
I sent some e-mails to root beer manufacturers to see if i'll get any info. wish me luck.
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oh baby oh baby, i like gravy.
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