We will cover Jacob 1-4 in a couple of weeks and I just wanted to share my belief in what Jacob is talking about in Jacob 2 in regard to polygamy... 

References:

D&C 132: 1

Jacob 2: 23

1 Kings 3: 14 and JST of same scripture http://www.centerplace.org/hs/iv/iv-1ki.htm#v3.14

1 Kings 11: 4,6 and JST of same scripture

Jacob 2: 27-31

1 Nephi 7: 1

Jacob 2: 31

Ezekiel 22

Jacob 2: 34

Jacob 3: 5

D&C 42: 22-24

D&C 49: 15-17

1835 D&C 101 https://www.josephsmithpapers.org/paper-summary/doctrine-and-covenants-1835/259#XD4B4D998-901F-440D-8768-5E54D7CAC8C8