Found this picture on the twitter account and it makes a wider perspective to me.
The JW religion is so part of the American way of Life, just like the other religions in the US.
In the JW growth rate country's there is a market for this "better" life. The religion makes it possible.
Western Europe had that marketing mix need after World War 2 and maybe a part of the cold war.
See the picture, and you know, the similarities with the JW religion, the change will be in details and not fundamental.
Gorby