China is at 3.08%. People need to remember part of that rate is set by demand. Zambia set their rate that high to attract buyers, but their bond rating is barely above default. There’s no demand. Who wants to buy a security that might default and trash your principle? It might not even last 3.5 years - which would be enough to regain your principle in interest.
Our economy is arguably the best in the world, out 10yr rate is much higher than many countries, that is why our securities are selling to the point of inverting the yield curve.
Europe is rushing to the Safe Haven - US due to poor economic policies forcing negative rates. Asians are rushing to the Safe Haven - US because of Hong Kong/China debacle.