I am reading up on the history of Puerto Rico since I will be visiting that US Commonwealth. I found a recent (2002) paper comparing the histories of Hawaii, Puerto Rico and our own Filipinas under US rule. This was written by a prominent American political historian who teaches at the University of Puerto Rico.
The conclusion is that by 1916 "Congress decided that Hawaii will be assimilated, Puerto Rico could be Americanized and the Philippines could never be assimilated [into the Union]"
Ninety years after we can ask what country is most Americanized? Hawaii, Puerto Rico or the Philippines?
Did the US Congress get it wrong?