Pretty sure it was Darwin... While most scholars didn't travel long distances at that time, Darwin did. he experienced in remote areas the diversity of life and evolution of a species.
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For Mexico, this was itself a provocation, but Polk went further, sending U.S. Army troops to the area; he also sent a diplomatic mission to Mexico to try to negotiate the sale of territory. ... Mexican forces attacked U.S. forces, and the United States Congress declared war.
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an opportunity to trade and gain wealth
access to rich resources and raw materials
access to valuable rivers and other waterways
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hope this helps :)
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➢ Refer to my attachment...
thank you!

Almost half the world over three billion people live on less than $2.50 a day. At least 80% of humanity lives on less than $10 a day. More than 80 percent of the world's population lives in countries where income differentials are widening.