The Columbian Exchange<span> greatly affected almost every </span>society<span> on earth, bringing destructive diseases that depopulated many cultures, and also circulating a wide variety of new crops and livestock that, in the long term, increased rather than diminished the </span>world<span> human population..</span>
The history of Kansas, argued historian Carl L. Becker a century ago, reflects American ideals. He wrote: ... When the area was opened to settlement by the Kansas–Nebraska Act of 1854 it became a battlefield that helped cause the American Civil War. Settlers from North and South came in order to vote slavery down or up.
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Islamic doctors developed new techniques in medicine, dissection, surgery and pharmacology. They founded the first hospitals, introduced physician training and wrote encyclopaedias of medical knowledge
<span>Vespucci realized the land he was exploring was a separate continent and not part of Asia, as he and many others believed at the time. The continents of North and South America are named after him.</span>
