Where does the $ come from? From Mexico, of course

Mental Floss replied to the question from above and it seems that the most cited theory is that the origins of the $ sign are from Mexican Peso. They had a P and an S an, with the time, it is believed that the US adopted a S over P so that there is currently the dollar sign $.

As for the truth, no one know for sure what and how happened, but it is know that the change happened in the last years of the 18th century. By 1801 and beyond US was already suing the $ sign.