^ In 1910 there was a number of extremely large and destructive wildfires in and around Montana and Idaho - web search for the big burn 1910. The land management agencies were either brand new (forest service) or didn’t exist yet (Park Service, BLM, etc) but the Big Burn was the catalyst for initiated/increased wildfire suppression on public lands. (There’s not much history for states’ wildfire management yet at that point)
Before that wildfires burned more or less freely - originally ignited by lightning or indigenous actions. But industrial grazing and logging were both severely altering the firescape and increasing the commercial demand for those resources.
So formal fire suppression policies and operations were developed and organized, and that worked pretty well (from a suppression standpoint) until towards the end of the 20th century.
But to answer the question, until the Euros started exploiting the west, yeah, millions of acres burned in an average year in the west, some years more than others. But fires weren’t always so destructive, though things like old growth even-aged Douglas-fir stands in the PNW show that there were stand-replacing fires back then.
Changes in weather patterns, vegetation patterns and conditions, habitation and population, etc. have made it kind of crucial.
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