It was built in to stop one branch of government from gaining too much power
Answer:
On this day in 1776, British forces are forced to evacuate Boston following General George Washington's successful placement of fortifications and cannons on Dorchester Heights, which overlooks the city from the south
The eastern and western deserts prevented invaders from the east and west. The deserts were a hard climate to travel through. Therefore, nobody could walk across to conquer Egypt. Furthermore, the cataracts in the Nile to the south protected the Egyptians from lands below them. So the answer would be that The Nile protected the Egyptians from invasion.
