Why is the north more developed than the south?

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?

If the imperial dynasty had continued to rule china, it is most likely that a) the economy would have improved rather than weakened b) european nations would have gotten more of a foothold in china c) revolutionary groups would not have gained any power in the country d) communism would not have received support among the poor

The people’s party supported fighting deflation by circulating