One of Lincoln's greatest achievements was (A) Building more factories in the North
(B) Selling cotton to Europe, and thus bringing money to the south.
(C) Starting the Social Security system.
(D) Preserving the United States of America

(D) Preserving the United States of America

Explanation:

He managed to keep the United States together though a Civil Way had to happen in order for differences to be sorted out

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you will need these

an outline of all three paragraphsan identification of the historical era that you are writing aboutan explanation of the term mass productiona description of two ways new technology affected industrya conclusion that shows how new technologies allowed industrialization to grow