Why did Royal Navy and US Navy carrier doctrine differ?

Why did the Royal Navy and US Navy develop different carrier doctrines?

Each navy adapted its ships and doctrine to the strategic environment it expected to face; given the other's circumstances, their doctrines would likely have converged.

Both navies saw value in parts of the other's doctrine, yet each adapted ships and methods to its own expected circumstances. If their strategic realities had been reversed, their doctrines would probably have converged. Judging either doctrine requires its geographical and strategic setting. The differences therefore say more about missions than institutional competence.