Anyone interested in how the events of his forgeries and subsequent murders unfolded should listen to this podcast episode [0] (parts 2 & 3). The tale is told by one of Hofmann's former friends, Brent Metcalfe. Brent's boss, Steve Christensen, was one of Hofmann's victims.
Just about is fair but still short by ~400 years, unless you count the Jaredites. They purportedly fled the Old World around the time of the Tower of Babel (~2000 BCE IIRC?).
EDIT: I wasn't sure if the Book of Ether even mentioned horses, but it did, along with elephants. [1]
> While the evidence for horses in pre-Columbian America is encouraging, it still requires some caution. Additional C-14 dating from other samples will be needed to change the prevailing view. Until then, this evidence should be considered provisional, but promising.
And it also says things like horses, chariots, steel, and other anachronistic things existed in the pre-Columbian Americas. There is no evidence (to date) to support any of those claims. You might want to look into the history of NWAF and Thomas Ferguson. Michael Coe, a renowned expert in this field and also mentioned on this post, was friends with Ferguson. It's an interesting history.
This can be disputed.