Australia and New Zealand manufacturers such as One Planet, Mont, Mountain Designs, Paddy Pallin, Macpac etc. are easily up there with the best U.S. manufacturers. Macpac in particular is a pretty well known brand, a maker of tents, sleeping bags, packs and clothing. Some of the others you mention are new to me. That's a difficult judgment to make. The outdoor gear market is pretty globalized these days, with fabrics and materials basically the same whether or not the gear is branded by a U.S., European, or Australian company.
Products made in the United States tend to be very good for several reasons.
One is that U.S. makers adopted technology fairly early on, such as the use of computer-aided design programs to make tents. Another is that the U.S. outdoor gear market is far bigger than the markets in Australia, New Zealand, or even all of Europe, and in an industry with low profit margins, that's important. U.S. makers can afford to offer a wider range of products, and sometimes to put a little bit more into their construction. It's just that across the board you can't go too far wrong with a U.S.-designed tent, pack, jacket or stove. The exception is in the boot world.