Instructions: This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
Input: The most significant fact of early and mid-Qing social history was population growth. The population doubled during the 18th century. People in this period were also remarkably on the move. There is evidence suggesting that the empire's rapidly expanding population was geographically mobile on a scale, which, in term of its volume and its protracted and routinized nature, was unprecedented in Chinese history. Indeed, the Qing government did far more to encourage mobility than to discourage it. Migration took several different forms, though might be divided in two varieties: permanent migration for resettlement, and relocation conceived by the party (in theory at least) as a temporary sojourn. Parties to the latter would include the empire's increasingly large and mobile manual workforce, as well as its densely overlapping internal diaspora of local-origin-based merchant groups. It would also included the patterned movement of Qing subjects overseas, largely to Southeastern Asia, in search of trade and other economic opportunities.
Output:
What happened in early and middle Qing history?