Check out this graphic. Even adjusted for inflation, we're spending more money than we did in World War II.
Of course, there are some things missing. We didn't have an interstate highway system in 1945. NASA, and weather satellites, didn't exist.
But the US government also didn't own car companies in 1945. Entitlement spending was a bit less than, and our military was several times larger than it is today.
And yet we're spending almost 4x as much today, in constant dollars, as in 1945. Wow.