Why are there many snowstorms in winter in America?

Under the influence of natural geographical factors such as climate and topography, the United States is prone to low temperature and snowstorm weather in winter.

There are mountains on the east and west sides of the United States, which run north and south, with a vast plain in the middle. The terrain is high in the east and low in the middle. Because there are no east-west mountains, the north and south are open, and winter is conducive to the rapid southward movement of cold air in the middle and high latitudes. At the same time, there are five largest freshwater lakes in the northeast of the United States, and there is a "Great Lakes Effect" in the five great lakes (referring to the phenomenon that cold air encounters a large area of unfrozen water (usually lakes) and obtains water vapor and heat energy from it, and then forms precipitation on the windward shore of the lake, usually in the form of snow). When the polar air mass passes south through the lake in winter, extremely cold air meets relatively warm water to form snowfall.