The movement of North American and Pacific plates cause earthquakes in California. The Pacific plate is moving northwest. It moves horizontally past the North American plate, its rate of movement is two inches per year. This horizontal movement causes earthquakes in California.
The boundary between these two plates is known as San Andrea fault. Pacific plate is the largest tectonic plate with an area of 103 square kilometres, it lies beneath the pacific ocean.
Hawaiian Islands were also formed 4.5 million years ago due to a hot spot in the middle of Pacific plate.
There are several important constitutional issues at the start of Reconstruction, but perhaps the greatest was if the newly freed slaves could be counted as citizens.
