Grade 7 and 8--a better fit for Grade 6, but still good for you all too... This article screams Rabinowitz and Harris!  From a very conservative newspaper, this is an article  about all the different religious book options that Congress members used for swearing in. It has some interesting stats about religion in Congress and seems to be fair in tone. Could be used as a great part of intro  for religions or a grabber current events....

A primary source letter from a slave who was still not free after emancipation proclamation and analysis of it...

Facinating website from  the US Army Center for Military History. It is a brochure summary of Mexican American War. PAges 1-9 have some interesting background about Mexico as NOT a democracy (a pro-US perspective) at the time, but also discusses that Polk had a goal of taking as much land as possible to force Mexico to sell CA. (an anti-US perspective). A secondary source, but may be a quotable one. 

Great collection of speeches and documents from both sides of the Mexican American war.

a collection of resources

This is from the National Archives. It has a collection of primary sources to use as well as ways to use them. Good Revolution stuff for Grade 7, including a timeline activity that has kids put primary sources in order during the Pre-Revolutionary period.  There is also an interesting pre-made activity on the difference in Civil War Recruiting posters.

a manifest destiny dbq essay question

A list of essential questions by US History unit, with a short presentation on one question from a scholar in video form.

A list of various PD organizations...some with workshops, some with materials

Diagram maker

Standard Article, but some good links!

interesting article that goes into slavery in one part of Africa today. cna see goods and bads of using it...