Spread disease such as smallpox which killed much of population.
Colonized most of land, taking from natives and forcing them to settle elsewhere.
Introduced them to European items, such as horses, guns, and some farm animals
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria Hungary.
Answer:
Currency?
Explanation:
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To the discovery of America, the " New World"