Answer:
the high demand for factory workers
Explanation:
The political and economic theories of Karl Marx and Friedrich Engels, later developed by their followers to form the basis for the theory and practice of communism.
The three continents on which the Seven Years' War was fought were "<span>A. North America, Europe, and Asia," although it should be noted that "Asia" in this instance refers mostly to India. </span>
A difficulty that had to be overcome during the building of the Transcontinental railroad was Native raiding on work camps.
