The set of countries with the greatest population densities are: england, france and spain; france, italy, spain; germany, italy, england or poland, england, germany

Germany, Italy, England

Explanation:

Population density is a measurement of population per unit of area. When applied to human populations, population density refers to the number of people that live in a unit of area (usually a square kilometer or square mile). This is usually calculated for a city, country or another territorial division. Population density is an important geographical term as it allows us to better understand the way a particular population lives in relationship to its territory and resources.

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in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: