151, in three years.
It now takes nine years to build one.
As Stalin said, "quantity has a quality all its own".
and I’ll raise you...
“Over the next four years, US shipyards would produce 2,751 Liberty Ships.”
Add that they also had to build new ship yards on both coasts and the gulf of Mexico.
Couldn’t get an Environmental Impact Statement approved for even one ship yard in that time frame today.