Most of Western Europe (such as Germany and France) is located in the cold temperate zone, with a climate closer to that of Northeast China, which was largely undeveloped before the Middle Ages. Similarly, Northeast China was primarily inhabited by the Manchu people who engaged in fishing and hunting.

In ancient times, the regions of Italy and Greece had relatively mild climates, but the agricultural conditions in both were inferior to those of the Guanzhong Plain, and even more so compared to the North China Plain. Even today, Greece's yield per mu is still poor, worse than Italy, and far worse than Guanzhong and North China.

The Roman Empire has some credibility, as the northern plains of Italy can be seen as an alternative version of the Guanzhong Plain/North China Plain. Ancient Greece… haha, it might be comparable to the ancient civilizations of the ethnic minorities in Guizhou.

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