Crosby's focus on smallpox changed his and later historians' views toward ecological and. ... Disease, specifically smallpox and malaria, was the main reason Europeans conquered indigenous peoples. Horses and weapons provided advantages, but infectious disease did the most damage.
A contract is an agreement, usually written out on a legal document, in which it states terms and agreements, as well as rewards that would be given at the end when the terms are met.
For example, a contract for assassination may be posted out in the black market. An assassin would then agree to take on the requirement of the contract. If it is met, the payment would be given to the assassin. If not, then the contract becomes void. This makes contracts important because the terms and everything is written down, and can be looked on for future references.
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In my perspective I think that Sparta was rather xenophobic, while Athens were open to foreigners.
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Well, this could be interpreted in a general view. A good way I've found to understand history especially is to almost interprete right now. I know this is not the answer but it is helpful. How can different view cause conflict? Simple you want to fight for your views because you believe they are right.