How could I determine the value of a a 1921 Yuan Shikai Chinese silver dollar?
I assume you are speaking of the numismatic value? because if you are not the answer is you weigh the coin and check the value of silver per ounce. Which is often the right answer to this question.
Alternatively you can check ebay and see what other ...
There is a strategic vision for the Japanese behaviour in China. This strategic reason is based on a few political/ideological reasons:
Japan needs resources
Japan first invasion of Mandchoukouo and Korea gave him resources but not enough
The military incident at Marco Polo bridge was the breaking point of a strategy:
This strategy consisted in capturing ...