Of the eight provincial, special administrative unit, and national documents that CCSSI has cited in their international benchmarking, seven only cover ELA in the last stage of high school, and one goes back to 8th grade. The Finns have a single document covering the core curriculum across 21 subjects and cross-curricular objectives for upper secondary levels.
Only the US has one document covering K-12, and in particular, only the US makes the fundamental structure of the standards a small set of skills traced back through the 13 years.
I would argue that the single K-12 structure of the Common Core is a major source of confusion and miscommunication. Even when on a basic level the problems at the primary and secondary levels seem to be the same, the causes and solutions are different. At the elementary level, it may actually make sense to just add more non-fiction to kids' reading selection, after all, they like dinosaurs and stuff! OTOH, if kids aren't ready to read their science textbooks in college, what's going on? They don't read their science textbooks in high school? There's some discrepancy between how high school texts and college texts are written? We have to teach high school science teachers to teach their students to read their science textbooks? Thinking of this as a single problem with a unified strategy is less helpful than dividing it up.