"Zoom In is a free, Web-based platform that helps students build literacy and historical thinking skills through “deep dives” into primary and secondary sources.
Zoom In’s online learning environment features 18 content-rich U.S. history units that supplement your regular instruction and help you use technology to support students’ mastery of both content and skills required by the new, higher standards:
- Reading documents closely and critically
- Identifying author's point of view and purpose
- Engaging in higher-order, text-based discussions
- Writing explanatory and argumentative essays grounded in evidence"
The above information comes directly from their website.