Who Nuked Hope County?

For fans of the series, the new setting likely isn't a complete surprise: as Polygon recaped (and uh, spoilers), the “good” ending of Far Cry 5 ends with the villainous Joseph Seed detonating a nuke and destroying Hope County.

What caused the nuke in Far Cry 5?

Wiki Targeted (Games)

The Collapse refers to a global nuclear catastrophe which occurred in September 2018, during the events of Far Cry 5. The Collapse was the result of escalating tensions between major world superpowers, which ultimately led to nuclear strikes on the United States.

Did Joseph seed kill his daughter?

During the accident his wife was killed, leaving him with only his infant daughter. ... He then killed his daughter by pinching the plastic tube attached to her face; shutting off his daughter's life support to prove his willingness to "serve God no matter what he asks.”