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I believe the answer would be B. established a free trade zone encompassing Canada, Mexico, and the United States. I did a little research, and this answer seems to be the best choice.
Answer: the correct answer is c) adulthood. The correct sentence will be A civilization reaches its high point during its <u>adulthood</u> stage.
Explanation: every civilization experiences a process: first, it is born then it grows, after that, it reaches its highest point and at the end, it declines.
The slavery issue changed political parties. The Whig Party collapsed, divided between anti slavery Northerners and proslavery Southerners. With this split, a Democrat won the 1852 campaign for president. Some Whigs joined the new American party.