The main objective of countries with economically imperialistic tendencies is to take and exploit the availability of certain goods in developing nations and use these for their own economic benefit.
The Vaco de gama voyage they were trying to achieve land in Africa.
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The answer is gunpowder and square sails
The ziggurat was so important to the summerians because it's roots in religious beliefs. By building them made the temples closer to the heavens &a closer to god. That is tied to the belief that gods appeared on earth at the highest point in the land.