They had more training in the snow and rough conditions compared to the US. This made it much easier for them on the Eastern front.
Limited government because we have a say in the government
The very fertile soil allowed enormous surpluses to be generated. The main crops were barley and wheat. The Sumerians had gardens shaded by tall date palms where they grew peas, beans and lentils, vegetables like cucumbers, leeks, lettuces and garlic, and fruit such as grapes, apples, melons and figs.
