Is it?
Research is on shaky ground:
http://www.sciencemag.org/news/2017/03/data-check-us-governm...
https://www.scientificamerican.com/article/dr-no-money/
https://www.theatlantic.com/science/archive/2017/03/trump-bu...
http://theconversation.com/men-get-most-of-the-research-fund...
https://www.vox.com/2016/7/14/12016710/science-challeges-res...
Welfare system is failing:
https://www.washingtonpost.com/news/wonk/wp/2014/09/29/our-i...
http://time.com/5090112/infant-mortality-rate-usa/
https://www.npr.org/2017/05/12/528098789/u-s-has-the-worst-r...
https://www.propublica.org/article/die-in-childbirth-materna...
https://www.theguardian.com/us-news/2017/dec/05/america-home...
http://www.bbc.co.uk/news/world-us-canada-42248999
https://www.ssa.gov/policy/docs/ssb/v70n3/v70n3p111.html
Education is failing en masse:
https://www.theatlantic.com/education/archive/2013/12/americ...
http://www.pewresearch.org/fact-tank/2017/02/15/u-s-students...
https://www.npr.org/sections/ed/2016/03/10/469831485/america...
https://www.forbes.com/sites/robertreiss/2015/11/17/how-to-f...
Millitary is using shoddy, ancient tools:
https://newrepublic.com/article/113484/how-pentagon-boondogg...
http://www.spiegel.de/international/world/us-modernizing-its...
http://nationalinterest.org/blog/the-buzz/the-us-military-re...
https://breakingdefense.com/2018/01/hasc-ew-expert-bacon-us-...
https://breakingdefense.com/2018/01/armys-basic-illusions-go...
But those numbers are meaningless for proving or disproving "inefficiency". The US is obviously getting far better infrastructure/education/welfare system/research/military/etc.