Greenhouse effect, Latitude, heat transport in the biosphere.
Hoover Daaaaaam and Volcanic Eruptions
World War 1 affected Eastern European countries mainly in the sense that it consolidated and reshaped the power structure in western Europe, meaning that blocks in Eastern Europe had to find new ways of interacting and trading with the west.
When these coordinates are graphed together, they create a square. Get graph paper, map it out, and that will basically provide all the explanation needed:-)