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.

Explanation:

d. direct

in which two ways were the northeast woodland indians and the southeast indians similar? both collaborated to form the iroquois confederacy. both cultivated the crops of corn, beans, and squash. both lived in rich environments of swamps and rivers. both lived in tree-bark dwellings called wigwams. both expected men to hunt, while women farmed.