After WWI the league of nations forced Germany to pay fpr the entire war, and took away all the land they had fought for. So it collapsed the German economy, which inevitably lead to WWII
Colonists wanted to go west and get land.
Answer:
The Colombian Exchange was an Exchange in between Native Americas and the colonizing Europeans. It saw the exchange of ideas (mostly from Europe), natural resources (such as crops), as well as diseases (which led to the demise of the native population).
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What war are they referring to?