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American life changed dramatically during the first part of the 19 century. The United States economy changed from a subsistence economy to a market economy. What does that mean and why did it happen? Write a will constructed I say that explains the difference between a subsistence economy in a market can explain the reasons why the shift a market economy occurredAmerican life changed dramatically during the first part of the 19 century. The United States economy changed from a subsistence economy to a market economy. What does that mean and why did it happen? Write a will constructed I say that explains the difference between a subsistence economy in a market economy. explain the reasons why the shift to a market economy occurred. Briefly describe the adjustments in manufacturing agriculture transportation and communication that took place in each section of the country during this period.