Stress because the pressure of the plates moving or sliding against each other creates stress
fault lines. when the pressure of the plates gets to a point where it cannot withstand it, it causes an earthquake which can make the crust of the earth bend and brake causing a fault line.
The united states is going to see a big population growth compared to japan and other countries because alot of immigration is happening both legally and illegally to the united states and will see a population surge of more than 5 billion population growth within 2 years