Minard and Napoleon

Here's a great interactive overlay of Minard's map combined with a matching interactive chart: Minard and Napoleon

Santa Rosa: Before and After

This is incredible: Santa Rosa: Before and After - try http://bit.ly/2hDEccy to see an image comparison.

State Borders

Gerrymandering

Found on FlowingData: Changing the Math on Gerrymandering (brilliant illustrations) and District - A Game about Representation & Redistricting.

Mapped: How the US generates electricity

Mapped: How the US generates electricity (by CarbonBrief) is a nice interactive map, zoomable to different states. This would go well with The Solutions Project and their 100 percent renewable energy portfolios for the different states.

Then there is the North American Power Plants map with a nice feature: it updates the summary legend as you zoom-in, zoom-out, or pan.

Data USA

Data USA is pretty great: tons of downloadable data, interactive maps, and shareable as image files.

Get Started with Story Maps

Get Started with Story Maps is a nice 2-hour introduction to Esri Story Maps, including the Story Map Tour, the Story Map Cascade, and the Story Map Journal.