This is a little tricky, as there were many escort carriers built by the US but turned over to other navies for operation, especially Britain.
Also you have to decide whether to count SABLE and WOLVERINE, coal-burning paddle-wheel excursion steamers on the Great Lakes that were converted into 'training carriers'.
Some carriers were just being finished when the war ended; at various stages from just launched, to completed, to commissioned, to working up for active service.
www.uss-salem.org/navhist/carriers
This site is maintained by Andrew Toppan, and contains several additional pages with really authoritative information about warships and navies generally.