Another writing convention I read long ago which grew out of typewriter limitation is placing a comma or period within quotation marks when not part of the quot

Another writing convention I read long ago which grew out of typewriter limitation is placing a comma or period within quotation marks when not part of the quotation as in: I'm a fully qualified "hacker." The period is not part of the quotation, but American writing style suggests it should still go within the quotation marks. America appears to be the only English speaking country to have this writing style; it's not that way in Britain, for example. I read this was due to something like ink splotching (or possibly it was jamming up of keys, which apparently gave us the non-optimum QWERTY layout) from where the typewriter would strike the page on mechanical typewriters when typing quickly if leaving the punctuation outside of the quotation marks as logic would dictate. I'm not sure how much truth there is to that, but I generally rebel and use the British style when writing, especially in informal situations like posting online comments.