is steam engine one of the options?
Losing favor after 1828, the earliest method of nominating candidates for office was the legislative caucus. The correct option among all the options given in the question is option "A". The actual meaning of caucus in terms of politics is the gathering of supporters of a common political party. Although the term appeared in the United States of America, but later on it spread to other countries like Australia, Canada etc.
The answer is: shifting from an agrarian lifestyle to an urban lifestyle.
Qing dynasty between 1661 and 1722
By baptizing them.
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