Which preposition to use with diversification

of Occurrences 25%

By this constancy of diligence and diversification of employment, he in time collected a sum sufficient for the purchase of a small printing-office, and began the Gentleman's Magazine, a periodical pamphlet, of which the scheme is known wherever the English language is spoken.

as Occurrences 1%

It is liable to the same diversifications as the preceding metre.

by Occurrences 1%

Industries are forced into an earlier diversification by tariffs.

for Occurrences 1%

Politicians were advocating the home production of cloth and foodstuffs as a demonstration against the protective tariff, while the economists pleaded for diversification for the sake of permanent prosperity, regardless of tariff rates.

into Occurrences 1%

Those who allow them to be of one species must admit an actual diversification into strongly marked and persistent varieties, and so admit the basis of fact upon which the Darwinian hypothesis is built; while those, on the other hand, who recognize a diversity of human species, will hardly be able to maintain that such species were primordial and supernatural in the common sense of the word.

Which preposition to use with  diversification