What does 1 Kings 14:21 mean?

Meanwhile, Rehoboam, Solomon’s son, was king in Judah. He was forty-one when he started, and he ruled seventeen years in Jerusalem—the city God chose out of all Israel to put his name. His mother was Naamah, an Ammonite. 1 Kings 14:21 - Modern Text Bible

(Rehoboam, Solomon’s son, ruled Judah for seventeen years. His mother was from Ammon, and Jerusalem was the city God chose.)