Why were long-term enlistments not a popular idea?

you were admitting that the war would probably take longer to fight.

there was a danger that the army would become a separate entity
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three-year enlistments were hard to fill; very few would sign up for that long.

the confederate army only required one year.

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).