"The 2020 census is in serious trouble" -- Vox, 2018, 5:06 -- https://www.youtube.com/watch?v=xZTD-00H1jE

A short history of the census along with some thought-provoking problems about measurements and categories. This would be good for a discussion populations, surveys, and political uses of data. 

From the video's description: The 2020 census was added to the Government Accountability Office’s list of programs with a high-risk of failure. And failing to accurately count the population would threaten the integrity of the country’s most authoritative dataset that drives public policy. Because the census is used in for a myriad of democratic functions, it’s important that the US gets it right. But now the Department of Justice has proposed to change the 2020 form, which could create further problems for the bureau.