A. Sophisticated technology first appeared
B. Machinery was used for the first time.
C. People were involved in trade to earn money.
D. A big amount of labor was employed in agriculture
Đáp án : D
Dòng đầu tiên: In the early 1800’s, over 80 percent of the United States labor force was engaged in agriculture -> đầu những năm 1800, hơn 80 % lao động Hoa Kì tham gia vào nông nghiệp
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