And spent about 2.5% of US GDP a year for 10 years. Todays equivalent about $700B per year, or about the entire US Military spend. That's not meant as a criticism, just an important note to how much effort the country put into it.
I am not seeing the societal level of commitment for that kind of spend now, to say the least. Heck, the way things are, I don't think you'd get that level of spend even if a killer asteroid was going to hit in 12 months. Half the country would still be like "but what about my (insert sacred cow here) subsidies?"
edit- Letterkenny beat me to it; and different numbers, but I suppose that's a result of different google search terms lol.