War. People at both ends of the trading route have to keep that area peaceful or trade will not occur.
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There are 10.6 decades. Or 10 decades plus 6 years.
70 decades
There are 70 decades in 7 centuries. This is because each century consists of 10 decades, so when you multiply 7 centuries by 10 decades, you get a total of 70 decades.
There are 100 decades in a millenium
20 decades are in 2 centurarys