Until the 1830s however the country really operated on a silver standard because at 15 to 1 the Americans mint ratio of silver to gold undervalued gold and led to its disappearance from circulation Greshams Law in details above

What is the correctly punctuated version of this sentence?
Until the 1830s, however, the country really operated on a silver standard, because at 15 to 1 the Americans mint ratio of silver to gold undervalued gold and led to its disappearance from circulation (Greshams' Law in details above).