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Would love to answer your question. As i'm the history geek but sadly there is not enough information to answer this.
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They all had absolute rulers who built strong, central governments.
The Pacific Railroad<span> Act chartered the Central Pacific and the Union Pacific </span>Railroad<span>Companies, and tasked them with building a </span>transcontinental railroad<span> that would link the United States from east to west. ... This affected the Native Americans in a negative way because the Native Americans used buffalo for many things.</span>
Trade flourished because these progressing empires were developing new ways to produce products and utilize agriculture in their areas, such as Han with silk and Rome with olives and fishing/seafaring. These empires has never had access to goods that were from other areas before the Silk road, causing trade to become immensely popular and relied upon.
