A Russian aircraft carrier Admiral Kuznetsov has an interesting aspect: the edge of the runway is raised, which “pushes” the plane in the air during the takeoff. Looking at takeoff videos, the curved edge seems very natural.
All USA aircraft carriers I can think of have an absolutely flat deck, similarly to, for instance, USS Abraham Lincoln:
The Admiral Kuznetsov's curved deck provides benefitsThe Admiral Kuznetsov's curved deck provides benefits, so why were most carriers not built the same way?