You didn't list options, but essentially Adam Smith called the discovery of America one of the most important events in history because it led to increased trade and interchange between nations and continents, which brought about economic benefit for those involved.
In his famous book, <em>The Wealth of Nations, </em>Adam Smith said that "The discovery of America, and that of the passage to the East Indies by the Cape of Good Hope, are the two greatest events recorded in the history of mankind." Both of these events facilitated and encouraged an increase of trade, which led to increased wealth and prosperity.
Historical context:
The basic principles of capitalism were laid out by Scottish philosopher Adam Smith in his influential book published in 1776: <em>An Inquiry into the Nature and Causes of the Wealth of Nations.</em> The Nobel-prize winning 20th century economist Milton Friedman said of Adam Smith, "“The key insight of Adam Smith's Wealth of Nations is misleadingly simple: If an exchange between two parties is voluntary, it will not take place unless both believe they will benefit from it." Smith argued for such voluntary exchanges within a free market system. He labeled the government-manipulated economic system that was prevailing in his day as "mercantilism," a system in which governments specifically authorized some merchants as the official agents of commerce (rather than endorsing free enterprise). The mercantilist system also viewed wealth as though there were a fixed amount of it available in the world, represented by precious metals such as gold and silver, and that nations were in competition over who got more of that fixed amount of world wealth. Smith saw that wealth was something that could be created and increased through voluntary exchange and free trade. Smith's ideas formed the basis for what we have come to know as capitalism. For Smith, the expansion of trade that occurred because of the discovery of the Americas and the discovery of sea routes to Asia were ways that wealth could be exchanged and increased more readily.
I agree with that statement
Silk road connected the trades between countries in Asia, Europe , and African region. During this trade a lot of things were exchanged between countries among these continents, such as artworks, technology, scientific knowledge, etc which pretty much contribute to all the development that started to emerge in post-classical world.
Roman engineers built bridges and roads, which allows for more quicker travel from one part of the empire to another. They also built forts and walled cities in many places, and filled them with supplies, so that if there was a revolt, the Romans there (if they are outnumbered) are able to take refuge inside until reinforcements arrived.
These all help their military have a higher chance of surviving, faster transportation, etc, and it made their armies the most strongest in that era
hope this helps
