In _________, about 45 million acres of land in the USA was under wheat.

What were the number of acts that the British parliament passed, relating to the Enclosure of Land?

Who was responsible for introducing opium to China? 

The threatening letters cultivated widely in the north west of England was signal by the mythical name  

Lin Ze-Xu, special commissioner at Canton in 1839, estimated that there were over ____________ million opium smokers in China.

In the late 18^th century, the English East India company was buying tea and silk from ___________ for sale in England.