Only era can vary in length of time.Era means age,period which doesn't exactly define the time
Century=100 years
decade=10 years
millennium = 1000 years,
In slavery the slave was not seen as a member of society so he could not buy, what he produced was not much and the expenses to bring and keep the slaves were becoming many.
It would be difficult to keep semi-wage earners on large properties: given the availability of land, they could try other forms of life - becoming artisans, squatters and small farmers, for example - which would complicate the flow of labor to the mercantile company, in which large traders and owners .
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Explanation:
Terms in this set (5) What were the major factors contributing to US expansion in the 1840's? Territorial expansion happened as a result from war with Mexico and international disputes; treaties were made that required more land.
What does this map reveal about the U.S. railroad network in the 1850s? - The North had the highest concentration of railroad mileage in the United States. - Four trunk lines linked eastern industrial centers with western farming and commercial centers.
What does this map reveal about the U.S. railroad network in the 1850s? Correct Answers: -The North had the highest concentration of railroad mileage in the United States. -Four trunk lines linked eastern industrial centers with western farming and commercial centers.