Poverty, mainly. The article mentions: > If you’re hard to count, you’re hard to count. The people who are hardest to count, the ones we worry most about in te

Poverty, mainly. The article mentions: > If you’re hard to count, you’re hard to count. The people who are hardest to count, the ones we worry most about in terms of undercount, are the same folks whose families don’t have food at night or don’t have a job. They’re worried about getting tossed out because they can’t make the rent. Or they’re ill and don’t have health insurance. Those folks tend not to have participating in the census at the top of their minds because they have basic needs that have to be met — for themselves, their children and sometimes for their parents and grandparents.