By then end of WWII, the United States had more ships in its Navy than ALL the ships of the rest of the world combined!
My mom was a 22 year old assistant in the Navy Dept in NY. Her job was certifying the newly commisioned ships were manned, fueled and supplied before her boss would certify them for shakedown cruises. One day she goes into the common room and sees the week’s losses posted. She finds four LSTs listed as sunk that she had not finished certifying for shakedown.