America delivered more than 357,000 aircraft; 12 million small arms; 47 billion rounds of small arms ammunition; 11 million tons of artillery ammunition; 1.6 million trucks, tanks, tank chassis; 5777 supply type ships; 107 CVL/CVE carriers; 29 CVB/CV carriers; 8 BB; 1050 LST; 76 CB/CA/CL cruisers; 857 DD/DE; 203 SS.
Compare US aircraft production figures to those of the major combatants and you'll see the numbers that led to victory.
ALLIES
USAAF — 297,199
USN — 60,456
Great Britain — 131,549 [RAF,RN]
Russia — 158,218
AXIS
Germany — 119,871
Italy — 11,508
Japan — 76,320 [IJAF,IJN]
US Submarine production (for domestic use - I don’t know how many we exported, if any):
1940: 5
1941: 13
1942: 33
1943: 56
1944: 79
1945: 42 (part year)
Pretty impressive ramp up from 5 and 13 pre-war to 56 and then 79, more than one per week, in the last two full years of the war.