On 7 December 1941, the U.S. Navy had seven aircraft carriers
By war’s end in 1945, the United States Navy had added twenty-seven aircraft carriers
https://www.google.com/search?lr=&as_qdr=all&ei=m7WBXKXkE6mw_QbGq7LwDQ&q=carriers+1945&oq=carriers+1945&gs_l=psy-ab.3..0i22i30l3.213080.224208..225968...0.0..0.116.382.3j1......0....1..gws-wiz.......0i71j0.sP8zs9zVqqg
And 72 escort carriers.
https://en.wikipedia.org/wiki/List_of_aircraft_carriers_of_World_War_II