I would say America has many different cultures mixed in. So many races live in America .
They must be completely aware and be a expert otherwise they will not be able to keep everything under control.
Explanation:
The force that causes most of the plate movement is thermal convection, where heat from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them. ... In ridge push and slab pull, gravity is acting on the plate to cause the movement.
