original passage: Because it is resistant to corrosion, nickel was occasionally used as a substitute for decorative silver. Nickel was also occasionally used in some countries after 1859 as a cheap coinage metal (see above), but in the later years of the 20th century, it was replaced by cheaper stainless steel (i.e. iron) alloys, except in the United States and Canada.
original sentence: iron) alloys, except in the United States and Canada.
sentence2: If an American collector purchased a mint-condition, pure-nickel proof coin of his or her nation's namesake "nickel" coin, would the interior of this collectible coin be wholly different than that of a garden-variety American nickel that had no value aside from the 5-cents on its face?
sentence1: Because it is resistant to corrosion, nickel was occasionally used as a substitute for decorative silver. Nickel was also occasionally used in some countries after 1859 as a cheap coinage metal (see above), but in the later years of the 20th century, it was replaced by cheaper stainless steel (which is an alloy of iron), in most places, with the USA and Canada being notable exceptions.