What is Main Idea #1 of the Battle of Antietam?

Known as "Antietam," the conflict was the worst one-day engagement in American military history and demonstrated that the Union army could compete with the Confederates in the Eastern theater of operations. The preliminary Emancipation Proclamation was issued in a time of strength rather than despair, which enabled President Abraham Lincoln the confidence to release it.

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fmr1 gene that can lead to fragile x-associated disorders.

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i think the answer is c, rivers.

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sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.