Are we talking the USN 1944? or present day? In 1944 the USN was very much Pacific centred and the RN in the Atlantic/Home waters. Evidence being that at D-Day 75% of naval forces were RN.
Of course naval power now is centred on Carriers and Subs, but Carriers are (opinion only) airforces at sea rather than traditional battle platforms whether Battleships, Cruisers, Frigates etc.
Today the USN mirrors the total ocean dominance of the RN in the 19th C, the period 1900 - 1990 may have seen many awesome fleets with a combined punch of sheer magnitude, but they could cancel each other out, that was not the case in 1880 or indeed 2004
\"We have ceased to be a nation in retreat\" Margaret Thatcher 1982