I believe that is was the Mongol Invasion
The Great Depression happened
Jan 1, 2014 is when Michigan State won
The demand and supply of labor are determined in the labor market. The participants in the labor market are workers and firms. Workers supply labor to firms in exchange for wages. Firms demand labor from workers in exchange for wages.
This would really be the same with any religious art. People believe in something so they draw or paint it.