The Kings of Judah were prophesied to always be ruling over the children of Israel. Furthermore David’s line on the throne, meaning his descendants were promised to last forever. So where are these Kings of Judah? Where were his everlasting dynasties? They were in Europe, ruling over the Europeans who are the Israelites.
This video shows some of the genealogies and family trees. Including both the Zarah and Pharez lines which came from Judah. Both had distinct dynasties and kingdoms. Eventually the two trees merged together.