>>64031690
[2/2]

tl;dr
It was only after we withdrew from the INF Treaty in 2019 that the US could legally develop missiles with enough of an advantage in range over the ATACMS to justify the cost, and pretty much the next day we started designing the PrSM which outranges the Iskander and doesn't need as big of a warhead because its CEP isn't straight out of the Brezhnev era.

tl;dr;dr
We don't have an equivalent of the Iskander because we have something that's better.