I can't speak for others, but I downvoted your question due to an apparent lack of research and citations. Also, the (mostly frankly hard to believe) claims make the question seem like there is an agenda behind it.
I could find no references online to Thrace occupying Algeria, and the claim that "Thracia occupied all England and they have made cities and many things there", plus the fact that the question is extremely broad, made me vote to close as well.
Actually, I don't usually downvote and vote to close - in fact, I try hard to avoid both. As your question here on meta seems to be a genuine attempt to understand why your question was so poorly received (which makes me think that you do not actually have an agenda), I've removed my downvote. However, I cannot vote to reopen as there are too many problems with your question.
First, you to limit your question to Thrace in relation to one country or area. Then, you need to cite the source of the claim in the question and (if possible) mention another source that supports it.
Next, you should do some googling to see what other sources say. A good place to start is Wikipedia; it's not perfect, but it's a good place to start and most of the articles have been written in good faith and have sources and footnotes.
So, if you want to know about your ancestors, I suggest you start with Wikipedia and work from there. If you find information there that is unclear or which contradicts other sources you have seen, then you can begin to write a question. For example, you could look at my question Did the Romans eat breakfast?. Also, look at other people's questions, especially more recent ones that got a lot of votes (although some questions get a lot of votes because the topic is popular rather than because the question is good).
You can also ask questions if you want to know more than you have been able to find. For example, you read that King XXX died in battle but there is no information on which battle or where it took place (so you could ask about that battle). Have a look at this question: Why did the Royal Society in 1771 believe that a continent further south than Australia should exist?.
Finally, follow the advice that sempaiscuba gave in his comments. He is a moderator and a very good contributor on this site so he knows what he is talking about!
Hope this helps.