Regarding Dan - In Genesis 49, Jacob states that Dan will judge his people. The Roman Empire had such a great judicial system that it was copied by Great Britain and then by the United States. Today, that country would be Italy.
As I have said, no one else agrees with me. I don't expect you to agree with me either - nor am I passing this off as "fact".
Just for the record - based on my interpretations of Genesis 49, I believe the Tribes of Joseph, which will be the most powerful and will NEVER be conquered because Joseph and his sons remained loyal to God while in Egypt, to be the United States, Great Britain, Canada, Australia, New Zealand, etc.
I believe Zabulon, a sea-faring people, to be Spain, Portugal, Central and South America, etc.
Judah is the ONLY Tribe to maintain its identity - the Jews.
Reuben, which never will be first, MIGHT be Ireland.
God promised Abraham that his seed would be as plentiful as the sand of the sea. These Tribes might be "lost" to history, but they are NOT "lost" to God. He KNOWS where they are. Even if I am not correct in my interpretations, these Tribes are somewhere - and they are NOT the Jews because the Jews are only one Tribe.
I hope that explains my beliefs on that topic.