Firstly, I'm moving your post to the US Currency forum.
Personally, I do have some American currency in my collection, although it composes not even a percentage point of my entire collection. None of it is of any significance, and is more just to have rather than focussed on a particular aspect of the very broad category that is American currency. All of my notes are post-1928 (ie: small-sized), but I do have a couple Federal Reserve Bank Notes, a pile of Silver Certificates, a bunch of National Currency, and even a Hawaii-overprinted $1 alongside an assortment of Federal Reserve Notes. Lately, I have tried to get 1-2 C.UNC notes of the current issues in sequential order for each denomination (ie: an example of each).
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.