Upon the 150th anniversary of the Civil War, both the Washington Post and the New York Times started series on the war.
For the New York Times it was their Disunion series. As a blog that runs from the end of the war back to the beginning, it may be a bit of a challenge to find specific posts/articles. Their Timeline for the series may help find specific time periods or events.
Need a project for your students? Like the Gettysburg Address? Have them do their own Learn The Address project.