I wonder whether there would be also other options, but one very important aspect is the smog: the city center is where many industry-relevant things meet: the factories are all around it, transport, cars... and since it is surrounded by bad air, the air takes longer to dissipate. This is especially visible if the city is in a valley, such as Mexico city foe example.
This naturally led to the diffusion of multiple inventions, both those of the Mongols and those ideas the Mongols usurped from cultures they conquered. While the Mongols profited from the trade of silk and tea from China to Europe, they also spread the Chinese inventions of printing and paper.
Roman
Much of the Roman diet, at least the privileged Roman diet, would be familiar to a modern Italian. They ate meat, fish, vegetables, eggs, cheese, grains (also as bread) and legumes. Meat included animals like dormice (an expensive delicacy), hare, snails and boar.
Modern
Top it off with bread and a dessert, and that sums up a typical American meal. When I lived in Texas it was BBQ meat, usually beef brisket, pork ribs or chicken with beans and cole slaw. ... The meat is usually smothered roast beef or pork. Sometimes a baked chicken is the centerpiece or a huge meatball.
To expand and establish Germany’s dominance, which in his eyes, required killing off people who he deemed to be imperfect
