Albert Barnes Commentary 1 Kings 10:23-24

"So king Solomon exceeded all the kings of the earth in riches and in wisdom. And all the earth sought the presence of Solomon, to hear his wisdom, which God had put in his heart." — 1 Kings 10:23-24 (ASV)

See the marginal references. By all the earth, we are, of course, only to understand the kings or people of neighboring nations.