Why did paper money loose value around the American Revolution.?

Answer 1

Because they printed so much of it to finance the war.

Answer 2

I don't know, but... Five to ten per cent of your cash (fiat, promissory) reserve/savings should be converted into gold bullion.

Gold has always been and will always be, in all situations, currency.

May I suggest a minimum acquisition of 10 gram (and only up to 1 ounce, each piece) gold bullion of reputable origin: PAMP Suisse, Credit Suisse, Engelhard, Johnson Matthey, Heraeus, Chiasso.

Numismatics (coinage) adds arbitrary rarity value, and is commonly less than 99.99% pure; its realm is that of the collector not the investor.