This was probably coming for awhile given the kickback Vista got over Savage a couple years ago after one or another of the mass shootings in the US.
The individual companies / brands Vista sold have been bought and sold numerous times in the past. It's been a very long time since Messrs. Speer owned CCI & Speer. As for Alliant, most of their product line is made in Europe. As for Remington & Barnes, well, it was only a few years ago they were part of a bankrupt conglomerate that could just as well have disappeared & the machinery sold off-shore.
No need to panic methinks.
Don't forget, Canada's military ammunition is made by a foreign company, after the Feds sold IVI to SNC Lavalin [now Atkins Realis, a ploy to throw off info-seekers] , who turned around and sold it to General Dynamics in 2006.