Comparing budgets by adjusting for inflation doesn't make any sense. A budget that served a country of 218 million in 1976 would, when adjusted for inflation, serve a country of 218 million in 2026. Percentage of GDP is what you want to look at.
Budget-to-GDP ratio in the US is close to 40%. (On that note, you should really consider federal + state combined rather than just federal.)
In early 1900s this same ratio was around 5-10%.
It has been increasing pretty much everywhere during the 20th century. It has made me wonder whether much of the prosperity we've seen and felt might not be a result of this ever-increasing percentage. Essentially we're spending more and more and that makes it feel like we're progressing faster than we are. Eventually it's going to have to stop though and I dread what happens when we do.
I don't see why we'd eventually have to stop this level of spending. The debt is unsustainable, but that's a policy choice to keep taxes too low for the level of spending we've chosen.