Yes, Carla, this "provision" adjusted as secular divorce laws changed in these countries. It was the custom to separate from one spouse and live in a common law arrangement with another, children from both. Then the woman would study with jws and be told she had to go back to the first husband, who by then had a new woman. It would leave her without any financial support. So then they would have to try and get a divorce (expensive and at the time of this arrangement, not allowed due to the Catholic doctrine). So the polygamous arrangement was the custom or pattern of non-jws in that country.
But I have pointed out that in Africa, jws were allowed to stay married to alll their wives (or to a husband with many wives) just not take on any new wives until 1947. So why did the WTS not allow polygamy outside but Africa. Note how the WTS tries to blame others.
*** yb86 p. 210 Nigeria ***Ever since 1934 when some individuals objected to the requiring of monogamy among Jehovah’s Witnesses, polygamy had continued to pose problems for the brothers. Many who had become associated with Jehovah’s organization still kept several wives. These included some prominent ones who misapplied the scripture at 1 Corinthians 7:20: “In whatever state each one was called, let him remain in it.”
However, TheWatchtower of January 15, 1947, some months before Brother Knorr’s visit to Nigeria, explained that the Scriptural standard of one wife to one husband must be maintained worldwide. A letter was then sent to the congregations, giving polygamists six months to clean up their marital affairs or lose their privileges. The majority of the brothers were very happy to see this firm stand for conformity to Bible principles.
*** yb73 pp. 166-167 Ghana ***An important point discussed at this convention was the Christian standard of monogamous marriage. Prior to 1947 a number of the brothers (not the majority by any means) were living in polygamy. The standard of Christian morality as laid down at Galatians 5:19-21 and elsewhere in the Bible was respected and they endeavored to adhere to it. However, polygamy was not clearly associated with adultery. This was largely due to the fact that in African society polygamy is just as honorable as monogamy.
Finally, the January 15, 1947, issue of TheWatchtower appeared with an excellent article on marriage. The magazine plainly stated that “plurality of wives” is not for Christians.
Friday, April 4, 1947, at the assembly in Accra, Brother W. R. Brown gave a ninety-minute talk on marriage, based on the material in the January 15 Watchtower. Immediately that became the talking point of the assembly. For the first time polygamists were refused baptism and those already baptized in that condition were told to clean up in order to be acceptable in Jehovah’s organization.