I don't know how people can cope with having more than 1 wife or husband, 1 is enough to keep happy and keep up with.
Look at how many wives and concubines Solomon had, there must have been a lot of children born from those unions.
Wasn't the life expectancy a lot lower back in those days compared to now.
The total population for any time period can only be a guess at best. Even now new hidden tribes are discovered every so often plus with the ever changing birth and death rate there are no reliable statistics for total worldwide population.
So really With all the fields of science and the differing theories out there and all this available research/ information, the wts are no more enlightened or led by holy spirit than my little finger is, because they pick and choose what suits their needs or wants and ignore facts that have been proven by science but contradicts the bible or what they want it to teach.
No wonder they have such a harsh punishment if you think differently to them and you're deemed an apostate coz they don't have a leg to stand on against "the real truth" but don't want to lose their control over people or lose their income.