Problems with US education: What is the answer?

There are plenty of problems with US education There is no denying that our students are fairing poorly, not just by our standards but by the worlds standard.

The US used to lead the world in education, but no longer.
So what is the answer? If you think the solution is just spending more money, you may be surprised. Stay tuned!

As always sources are down here.

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Proficienty of 12th graders:
https://www.nationsreportcard.gov/reading_math_g12_2015/#
Education in OECD:
http://worldpopulationreview.com/countries/oecd-countries/

How we compare to the world:
https://data.oecd.org/eduresource/education-spending.htm
https://www.politifact.com/ohio/statements/2016/sep/21/donald-trump/trump-us-spends-more-almost-any-other-major-countr/
https://www.cbsnews.com/news/us-education-spending-tops-global-list-study-shows/
https://www.independent.co.uk/news/education/11-best-school-systems-in-the-world-a7425391.html

Poorer schools and teachers:
https://nces.ed.gov/programs/coe/pdf/coe_slc.pdf
https://nces.ed.gov/pubs2017/2017056.pdf

Teacher Salary: https://www.businessinsider.com/teacher-salaries-by-country-2017-5
Teacher effectiveness: https://www.nctq.org/dmsView/StateofStates2015
Unions, good or bad?:
https://www.ipsos.com/sites/default/files/ct/news/documents/2018-05/topline.pdf
https://www.americanexperiment.org/2018/05/teachers-agree-teachers-union-makes-harder-fire-bad-teachers/
https://www.publicschoolreview.com/blog/are-teacher-unions-a-help-or-hindrance-to-public-education

Schools and Local Funding:
https://www.lincolninst.edu/sites/default/files/pubfiles/future-us-public-school-revenue-policy-brief_0.pdf
Standardized Tests:
https://standardizedtests.procon.org/
https://education.cu-portland.edu/blog/news/do-standardized-test-show-an-accurate-view-of-students-abilities/
https://www.edweek.org/ew/articles/2012/11/29/13testcosts.h32.html?tkn=VLMFJUQpeyvKkTzwuCHPd%2FuQG%2BPWLRr..