What is an economic depression and what was different about the great depression?

A state of the economy resulting from an extended period of negative economic activity as measured by GDP. It is often described as a more severe form of a recession that leads to extended unemployment, a spike in credit defaults, broad declines in income and production, currency devaluation and a deflationary economy.

I know that the Great Depression was the longest and most severe depression ever experienced by the industrialized Western world, sparking fundamental changes in economic institutions, macroeconomic policy, and economic theory.

I think that will help you I hope it does. : )

After Napoleon`s defeat in 1814 leaders of many nations tried to draw up a peace plan for Europe. Metternich was the Austrian foreign minister who sharped the peace conditions at the Congress of Vienna in 1815. After that Congress kings and princes reclaimed their thrones. Metternich wanted to make sure that France would not attack another country again. France lost the lands in Spain, Italy and Netherlands. Countries that Napoleon had had controlled became independent states.