"The use of the assembly line was key tothat was popularized by the Ford Motor Company in the early 1900's."

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Explanation:

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b.provides a written record of the transaction

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.