Currently the State and Country Pages in old search (the pages you get to when you click on the maps on the search home page) are not listing data collections as they usually do. We are aware of the problem and are working on fixing it quickly.
Both old and new search are working correctly, it is just these pages that are not listing data collections as they normally do.
I will post an update when they are working.
We appreciate your patience.
The State and Country pages are working again, as are the images from the 1830 US Census.