In the 10 years before WWII the US built 10 warships (Emergency Shipbuilding), and in the 5 years following it built 6000 warships.

There are two parts: (1) about 10 warships built in the 10 years before US entry into WWII; (2) about 6,000 built in the 5 years that followed. Judge against naval and shipbuilding histories. True: both figures are roughly right for warships (combatant naval vessels), within about ±30%. Mostly true: both are right in order of magnitude, with one figure off by more. Mixed: one part holds and the other does not. Mostly false: the figures are real but refer to something other than warships, for example Emergency Shipbuilding Program merchant ships (Liberty/Victory ships), or are otherwise badly mischaracterized. False: both figures are far off for any reasonable ship category.

Set before the research began.

1. E1 How the USA Flexed its Industrial Muscle in 1941 - Naval Historical Society of Australia Naval Historical Society of Australia (reprinted from Naval Historical Review) · June 1998

   “From December 7, 1941 to August 15, 1945, American shipyards constructed 10 battleships, 13 heavy cruisers, 33 light cruisers, 27 aircraft carriers, 110 escort aircraft carriers, 352 destroyers, 498 destroyer escorts, 203 submarines and 109,642 small vessels”

2. E2 The Breakdown in Naval Shipbuilding U.S. Naval Institute, Proceedings · January 1978

   “In the short span of 44 months between the Pearl Harbor attack and V-J Day, 1,496 oceangoing warships and 4,915 cargo ships were constructed.”

3. E3 The Maritime Administration’s First 100 Years: 1916 – 2016 | MARAD U.S. Maritime Administration (MARAD), U.S. Department of Transportation · 25 February 2022

   “The January 1941 production increase, the first of several during the war, became known as the Emergency Shipbuilding Program.”

4. E4 Building Major Combatant Ships in World War II U.S. Naval Institute, Proceedings · May 1947

   “Japan’s surrender immediately brought the war-end cancellations of August, 1945, which, with some minor adjustments that followed, left 100 ships to be completed as of October 1, 1945, this number being 8% of the war program of 1220 major combatant ships.”

The evidence shows about 1,496 oceangoing warships and 4,915 cargo ships built from Pearl Harbor to V-J Day [E2], which does not match 6,000 warships. No evidence item covers how many warships were built in the ten years before the war, and E3 does not say the Emergency Shipbuilding Program was a merchant program. So the evidence cannot decide between the criteria's outcomes.