What does “when a democracy is destroyed ,it will not be from enemies from without ,but rather because of enemies from within mean ?

What event caused south carolina to secede from union in 1860

7. how did the early egyptians use the flooding of the nile river to their advantage? they diverted the water to flood their enemy's lands and destroy their crops. they created an easier way to travel to the mediterranean sea and the indian ocean. they established a new water-based athletic event for the ancient olympics in greece. they devised an innovative irrigation system, which created a surplus of food.

Whose plan centered on keeping the federal budget balanced, instituting tax cuts, and developing public works projects?