Moreover, he made high places in the mountains of Judah,.... Temples and altars for idols, which, being built on mountains, had the name of high places; and these Jehoram made or rebuilt were those which had been pulled down by Asa and Jehoshaphat:
and caused the inhabitants of Jerusalem to commit fornication; that is, idolatry, drawing them by his own example to worship Baal, for he did what Ahab and his family did, 2 Chronicles 21:6, and compelled Judah thereto; the inhabitants of Jerusalem falling into the same idolatrous practice with him, he forced the inhabitants of the cities, and in the country, to do the same, who it seems were not so willing and ready to comply therewith.
Keil & Delitzsch on 2 Chronicles 21:10-11
The chronicler concludes the account of the revolt of Edom and of the city of Libnah against Judah's dominion with the reflection: "For he (Joram) had forsaken Jahve the God of the fathers," and consequently had brought this revolt upon himself, the Lord punishing him thereby for his sin. "Yea, even high places did he make." The גּם placed at the beginning may be connected with בּמות (cf. Isa 30:33), while the subject is emphasized by הוּא: The same who had forsaken the God of the fathers, made also high places, which Asa and Jehoshaphat had removed, Ch2 14:2, Ch2 14:4; Ch2 17:6. "And he caused the inhabitants of Jerusalem to commit fornication," i.e., seduced them into the idolatrous worshi…
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