One massive change is that there is almost no ethnic food on these menus (unless you include French). I looked at some of the LA menus and there were zero Asian, Mexican, or Italian dishes. It's impossible to imagine today that you could look at a bunch of hotel restaurant menus in LA and not find at least some dishes that were inspired by those cultures.
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If you wanted Chinese fits in the 1800s, you went to a "chop suey" shop in Chinatown.