Every nuclear weapon in the active US stockpile has a secondary fusion stage, the last pure fission weapons were removed from service and dismantled in 1992.
Most of the cost in a nuclear weapon is in the primary. It only makes sense to build pure fission weapons when you want very low-powered nukes for close range tactical use; the DoD has determined that don't see enough use for them to justify the upkeep of specific weapons.
All fission weapons are not necessarily also fusion weapons. But probably most are nowadays.