The people disagreed on religious beliefs. The land was not big enough for everyone. The people rebelled against high taxes.
Explanation:
When Solomon's successor, Rehoboam, dealt tactlessly with economic complaints of the northern tribes, in about 930 BCE (there are differences of opinion as to the actual year) the Kingdom of Israel and Judah split into two kingdoms: the northern Kingdom of Israel, which included the cities of Shechem and Samaria, and the southern Kingdom of Judah, which contained Jerusalem. Most of the non-Israelite provinces became independent
