Spices in Europe where expensive because they where not very abundant, since they had to bring it from places like India.
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Because moving traded goods great distances by floating them
on the water is just about the easiest and cheapest way to
deliver them from one place to another place.
The Dust Bowl, also known as the Dirty Thirties, was a period of severe dust storms that greatly damaged the ecology and agriculture of the US and Canadian prairies during the 1930s; severe drought and a failure to apply dryland farming methods to prevent wind erosion (the Aeolian processes) caused the phenomenon.
Islamic Achievements in Medieval Medicine: Hospitals and Doctor Training. Rather than viewing disease as a punishment from God as the Christians thought, Islam looked at disease as just another problem for mankind to solve. The Prophet decreed that the sick and injured should be cared for, not shunned.
After the colonial army victory at Saratoga, the British worked to bring the south under their control.
Recruited British loyalists to strike at the local patriot militias. Patriots near the frontiers rose up against the British led loyalists in bloody battles away from coastal strongholds.