When he went to Milan, the Duke Sforza appointed him to be a military engineer where he had to design weapons and technological advancements that would help the duke gain warfare supremacy against enemies. He also built buildings and defenses, not just offensive weapons.
The
Spain sold the Philppine archipelago for $20,000,000 after colonizing it for
333 years. Simply, through the Treaty of Paris, the United States got all the
remaining countries colonized by the Spanish empire. Before Spain sold the
country, it used its resources, man power, everything that they could use to
improve their economy.
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The first civilizations appeared in locations where the geography was favorable to intensive agriculture. Governments and states emerged as rulers gained control over larger areas and more resources, often using writing and religion to maintain social hierarchies and consolidate power over larger areas and populations.