I prefer Greenfield tap and Die spiral point gun taps from MSC, TIN coated, ground threads. They are precise, durable and beautifully made. MSC also has occasional sales, so when you go to their website, look for their specials.
OSG is USA.
Niagara is USA.
The GTD taps are made in Japan.
Cleveland Forge cutting tools are Mexican made.
Most Enco stuff is Chinese.
Starrett is now branching out into foreign made, Brazil, Mexico, China, and still some USA.