It's called "naruto", not "american history".
Says who?Please reference where it says that these kids never take lessons and do nothing but train and go have fun, all the time?
Who said "learning" is suppose to be a hobby?How does that indicate that they've never been taught how to read and write?Where's your substance?
Says who? How do you know they weren't taught how to read and write before they went on the battlefield or on the side?
But where's your substance?
It doesn't matter if the universe is Naruto. This environment is quite realistic.
And my "substance" it's what Hashirama himself said. The life expectation was of 30 years for everybody.
And the databook where it said that it was only when Madara and Hashirama met they could relax.
How can one expect to a kid in that environment be more focused on learning grammar instead of survival skills? :/
It's fact known worldwide. Where there is huge war environment there is illiteracy.
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World map of countries by literacy rate- 2015