Final answer:
The materials provided do not include information about the Chinese population growth in British Columbia; external historical sources would be needed for verification. However, the mid-19th century saw an increase in the Chinese diaspora in North America due to economic and political factors.
Step-by-step explanation:
The question regarding whether the Chinese population in British Columbia doubled from 1881 to 1891 does not have enough context provided here to confidently determine a true or false response. In the provided reference materials, such a specific demographic statistic is not mentioned. Historical documentation would need to be consulted to confirm the accuracy of this statement.
However, if we refer to the late 19th century timeline, a period that includes the stated years, it is known that the Chinese population in various parts of North America did increase significantly due to factors such as the Gold Rush and the building of the Transcontinental Railroad. An event that caused many Chinese people to flee their country in the middle of the nineteenth century was the economic distress and political upheaval following the Opium Wars, which is unrelated to the provided exercises but is historically factual.