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Unformatted text preview: Afroeurasian 27 Expanding Networks:
• A number of large states, or empires, appeared in Big Era Four.
• Empirebuilders had to move troops and supplies, dispatch messages, gather intelligence, and collect taxes.
• These tasks required good systems of communication and transport by land and sea.
• These systems were created mainly to serve the empire’s government and army.
• But they also served as highways of commerce, cultural exchange, and migration.
An empire is a state that unites
many territories and diverse
peoples under one ruler or
government. 28 Expanding Networks:
Routes Roman Roads
The Romans built an
extensive network of
roads. Over 50,000
miles of paved roads,
tracks, and trails
radiated from the Forum
in the center of Rome to
all parts of the empire.
all 29 Expanding Networks:
Though built primarily to speed
troops and supplies, Roman roads
were used for commercial
purposes, too. Goods were
shipped to distant provinces and
Constructed by skilled engineers,
the roads were strong enough to
support half-ton wagons and wide
enough to allow two-way traffic.
enough 30 Expanding Networks:
The Silk Roads was a network of roads,
tracks, and trails ran across Inner Eurasia.
Most of this region is part of the Great Arid
Zone, the belt of dry country that extends
Inner Eurasia Gr e Zon
ea 31 Expanding Networks:
Inner Eurasia is a region of grassy steppes, rugged mountains, and forbidding deserts. This terrain is hard to cross. Despite these harsh conditions, humans have been carrying goods, ideas, and technologies along the Silk Roads of Inner Eurasia for millennia. I n n e r E u r a s i a 1997, Encyclopedia Britannica Inc 32 Expanding Networks:
Domestication of the horse, ox, and camel made
humans more mobile.
About 3000 BCE, people in the steppes of Inner
Eurasia began to take up pastoralism. Because they
moved with their herds, they typically did not grow
Instead, they traded with farmers and city-dwellers
for food and o...
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- Fall '13