How different is high school mathematics topics from country to country?

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Artur Sergyeyev

For the description of US math education, see the first link below. The second link could perhaps be of interest too.

https://en.wikipedia.org/wiki/Mathematics_education_in_the_United_States

http://www.ernweb.com/educational-research-articles/math-curriculum-modeled-on-top-ranked-countries-transplants-well-in-us/

For the discussion of math curricula in different countries see also the link below.

https://www.quora.com/Which-country-has-the-hardest-Mathematics-in-their-education-curriculum

For some historical material, see also the link below:

http://www.jstor.org/stable/27955926