As I was looking for some info on the Florin in the Royal Mint 1935–36 Annual Report, I came across a section where some various facts about world coins are presented. The last such fact concerns the US commememorative silver halves:
… it would appear that the dangers to which Mr. Roosevelt called attention some time ago have so far been met by homoeopathic rather than allopathic treatment. The words with which I ventured in my last Report to express agreement were as follows: —“The practice of striking special coins in commemoration of historical events and permitting the sponsoring organisations to sell them at a profit is a misuse of our coinage system which is assuming dangerous proportions." It is now interesting to record that a Bill “To prohibit the further coinage of commemorative coins” was introduced in the House of Representatlves by Mr. Cochran in July of the current year.
I suppose the Bill passed since commemorative halves were not struck after 1939, and in very small numbers in that last year. Could it be linked to the start of World War 2? I doubt it since the USA didn't enter it right away.
But by our own standard, in this age of numismatic incontinence (Niue, Canada, etc.), it's almost funny to think that what commems they were issuing then was seen as “a misuse of our coinage system which is assuming dangerous proportions”.