Before proceeding further I think we need to ask where did these extra carriers go?And again the canonical evidence is that the US built 3 new aircraft carriers during the Sinclair Administration
Assuming that one of them is the USS Sandwich Islands, the other 2 are not noted in the story afterwards and it's very noticeable during the Second Great war as the Rememberance is only operating in the Atlantic alongside the USS Sandwich Islands and it was left alone as the sole aircraft carrier in the Pacific before it's loss at Midway.
I am not saying that the US only had the Rememberance and the Sandwich Islands in 1942. But it's a bit strange that if by 1930 they already had 4 carriers they would be hard pressed enough a decade later to allow the Rememberance to operate alone and also willingly send it on what amounted to a suicide mission. (With the assumption that the US would of course build more ships in the interwar period between the Pacific War and GWII especially since the budget cuts were rescinded)