It’s the one being waged against our own population, via mass incarceration and often inhumane treatment of inmates. From Reuters’ impressive gallery of the year in 95 photos, here’s the story behind this one:

LUCY NICHOLSON, United States

“I arranged to travel on a bus from Los Angeles with children who were visiting their fathers in San Quentin state prison. The prison has the largest death row in the United States, and the only gas chamber and death row for male inmates in California.

The children slept on the bus overnight as it made the nearly 400-mile journey, met with their fathers for a few hours, before returning to LA the same day.

I had arranged to meet reporter Mary Slosson from Sacramento at the prison. We chatted with the families and photographed them for a couple of hours. I wasn’t allowed to photograph one family who was visiting a death row prisoner in a separate locked room, but Mary talked to the press officer and arranged for Reuters to have a prison tour.

We were shown around the exercise yards, some of the cells, and the medical building. A lot of the prisoners wanted to chat to us, and they swarmed around as we walked through the exercise yard.

In the medical building we crossed paths with a death row inmate and other shackled “administrative segregation” prisoners. One inmate was sitting in a cage in an empty room, watching television.

We passed a room of administrative segregation prisoners sitting in cages for a group therapy session. I took four frames before the prisoners started staring and a guard told us to move along.