Answer:
Population density is a measurement of population per unit area
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Troika is the name given to a wagon driven by three horses aligned, thus, it served as illustration for the idea of a government with three leaders.
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Both groups are called Slavs. In the years before World War I, Serbia wanted all Slavic peoples to form one empire, free from rule by the Turks or Austria-Hungary. The Serbs' wish to unite all the Slavs in one empire is an example of. imperialism.
The correct answer for the question that is being presented above is this one: " Mexican-american war and the California joining the union as a state." The two events that fueled the debate over slavery between 1846-1850 are the Mexican-american war and the <span>California joining the union as a state.</span>