Why was the sacrifice made by the soldiers at gettysburg worth the price they paid

The graph shows the price of a good compared to the quantity demanded and the quantity supplied. on this graph, the bottom horizontal line represents an ineffective price floor set above equilibrium. an effective price floor set below equilibrium. an ineffective price ceiling set above equilibrium. an effective price ceiling set below equilibrium.

What would you call a political system that is only meant to last for a short time

How do the public-safety regulations protect workers ? regulations create advertising laws