What was one problem with overland travel in the late 1700s and early 1800s? It was impossible to ship goods over long distances

It was slow and expensive to ship goods over land

It was cheap to ship goods over land, but it took time

It was expensive to ship goods over land, but it was fast

It was slow and expensive because the railroad system hadn't been adapted yet

Explanation:

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the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof