Fiocci is an Italian manufacturer. I have used Fiocci shotgun shells and they are good. Italians like their shotguns as well as cowboy type revolvers and lever actions.
Aguila is Mexican. I know they make 22lr cartridges, and I think shotgun shells, but they may make primers also.
I have used some Czech powder, which was about $10 per lb. cheaper than American brands.
I also know that Fiocci just built a factory in the US, either Arkansas or Mississippi. Can't remember.
Federal, Remington, and CCI are all owned by a Czech company now that Vista Outdoors sold all their ammo stuff to this company. Now they are raising prices. I think Winchester is owned by Fabricae National now out of Belgium. FN also owns the Winchester and Browning gun manufacturing.
American companies have been decimated by all the "Free Trade" stuff. One of the reason most gun and ammo manufacturing as well as powder is now in the south is one, union labor costs, old tooling up north, and bad political environment in the northeast. Hunting, shotgun sports and shooting, pistol and rifle shooting are not as popular as they once were. All younger people care about is their phones and computers.