Why are the Star Wars movies out of order?

Related questions

1. How did Princess Leia die in real life?
2. Why is Leia a princess?
3. Was Star Wars a book first?
4. What's the longest Star Wars movie?
5. Will there be a 10th Star Wars movie?
6. Did the original Star Wars say Episode 4?
7. Is Rey Han's daughter?
8. Is it better to watch Star Wars in chronological order?
9. Is Rey Obi Wan's daughter?
10. Did Lucas write Star Wars?

Tags

1. #trilogy
2. #original
3. #release
4. #create
5. #before
6. #expanded
7. #empire
8. #episode
9. #added
10. #roughly
11. #titled
12. #released
13. #strikes
14. #movie
15. #which
16. #lucas
17. #originally
18. #first
19. #script
20. #entire