What do the symbols on the Illinois state flag mean?

Related questions

1. What does the Confederate flag mean?
2. Is there an East Side of Chicago?
3. What made Chicago a major city?
4. Why is Chicago called Chicago?
5. Why is Chicago so important?
6. What did the Confederacy fight for?
7. What does Illinois mean?
8. What is Illinois known for?
9. What is Illinois state flag called?
10. Why did Betsy Ross make the flag?

Tags

1. #means
2. #streamer
3. #history
4. #national
5. #union
6. #holds
7. #itself
8. #state
9. #sovereignty
10. #eagle
11. #under
12. #governs
13. #motto
14. #illinois
15. #representing
16. #government