<span>480). WOR-3 Explain how the growing interconnection of the U.S. with worldwide economic, labor, and migration systems affected U.S. society since the late 19th century. Foreign trade became increasingly important to the American economy in the late nineteenth century. The nation's exports had totaled about $392 million ...</span><span>
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I think it's population and transportation but I'm not sure
The Toltecs were responsible for establishing a variety of the basics that the rest of their Central Mexicans would follow. However, the Toltecs could not establish the major cities and trading centers that people like the Teotihuacanos and the Aztecs would later establish.
Roman Empire
The Fall of the Western Roman Empire (also called Fall of the Roman Empire or Fall of Rome) was the process of decline in the Western Roman Empire in which the Empire failed to enforce its rule, and its vast territory was divided into several successor polities.
Invasions by Barbarian tribes
The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders
