How British and American infrastructure made victory possible

What impact did British and American infrastructure have on victory in the world wars?

It made sustained victory possible by allowing the Allies to mass adequate equipment, expand production, and fund research until an enemy's initial technical advantage was overtaken or overwhelmed.

A technically superior weapon can be defeated by several good-enough systems when industry supplies them at scale. Infrastructure also permits simultaneous production and research, so immediate needs do not halt the next generation of technology. Britain had a vast network of defense research establishments, a part of the Allied advantage that often receives less attention. The resulting system could absorb setbacks, iterate, and continue supplying a global war in ways that a smaller industrial base could not easily match.