On a recent Sunday after lunchtime, I turned off the television and, along with thousands of other souls, lined up on the streets near the Rwandan Parliament. We were there for the annual “Walk to Remember,” to commemorate 25 years since the genocide against the Tutsis.

We wore black T-shirts marked “Kwibuka 25,” or “Remembrance 25.” We were a diverse group, which is both a testimony of what has been achieved by the post-genocide Rwanda and a unique human spectacle. “It sounds unreal, yet true,” let out a reporter. Rwanda has become a beacon of unity and integration. President Paul Kagame’s government’s vision of rebuilding “One Rwanda” where people live and form a nation together, killers and survivors, is an extraordinary achievement. I cannot remember any precedent for it in modern human history.