I think it is an apocalypse, like Revelation. It has import meant to convey a timeless message rather than a prediction about a particular king of the north and south. There will always be a King of the North and a King of the South. They also have a basis in history of famous North-South kings struggling against each other beginning with the unification of upper and lower Egypt by the first Pharoah. His story is an epic in many countries, perhaps transformed and retold in a different way by those rulers who are jealous of Egypt's success.Do you think the Book of Daniel is actual history?
There is a country called Babylon. There is an exiled group of Jews, and they are forced to live there and to eat unnatural food and to live with other rules than the reality they love. Christian writings may refer to them as those who were "Cast into darkness" from which some never returned, or "Bound with chains of darkness." The Jews in Babylon are compelled to live unnaturally -- against their Torah which they consider to be not simply a set of rules but more like a map. So they by living like Babylonians are leaving nature, leaving the universe that matters for one that doesn't. I don't think I can accurately portray what they think about it, but the idea is that many or all are no longer Jews. Simply eating ham and liking it may not seem like a huge deal to you and I, but to them it is devastating. They have lost the benefits of Israel when they are stuck in Babylon and have to keep its principles alive in new ways.
There are men like Daniel among the exiles -- perhaps many. There are evil men like the satraps who try to get him killed. Some, like Daniel, fight to live by the Torah as much as possible, to retain the hope that Israel represents. They resist assimilation, and they lament the failures of themselves and their country to follow its principles when they lived in Canaan before the Babylonians invaded. Christian writers (basically all I really know) interpret that the Jews were forced (in the first place) to go into Babylon because of their failure to keep the Torah. Then some were brought back, refined and newly aligned with the Torah again. Daniel is an important book for helping us to understand this. It contributes to the picture painted by Zechariah and Jeremiah. Its very personal, talking about how Daniel must resist the bad advice to eat various strange meats and resist the ways of the Babylonians. Its our picture of some Jews in exile.
Exile is part of the Jewish history even before Babylon. They start writing their Babylonian Talmud there, and we generally think about the exile to Babylon as 'The' main exile. It is not the first but is one of many. Its a big one, but before this there are many people kidnapped and made slaves who have lived in exile before. There have also been other invasions, so the idea of living away from Israel and yet being Jewish and upholding the same principles of freedom and love are already strong. Its just that with this Babylonian captivity there is a new understanding of a larger purpose for it. Daniel is a window into that.