1)
We already know that Yerushalayim is the city that Hashem chose!
1.
Rashi: Yehudah did not put this to heart, and sinned.
2.
Malbim: Due to this, Rechav'am should not have veered from Hashem.
2)
Why does it say that his mother was Na'amah ha'Amonis?
1.
Radak: He went in the ways of his mother and served idolatry after three years [of kingship], like it says in Divrei ha'Yamim II, 11:17. 1
2.
Malbim: She served idolatry in Shlomo's old age, and she counseled Rechav'am to do evil.
1
The verse says that they went in the ways of David and Shlomo for three years. (PF)
