What were the 3 main reasons for US entry into WWI?

Related questions

1. Which country should be blamed for ww1?
2. How did nationalism contribute to WWI?
3. Why did Germany take all the blame for WWI?
4. Could World War 1 been avoided?
5. Did Woodrow Wilson want to go to war?
6. Was ww1 avoidable?
7. What were four main causes of ww1?
8. Why is Austria Hungary to blame for ww1?
9. Why was Germany blamed for ww1 in the Versailles treaty?
10. Who won War of the Worlds?

Tags

1. #behind
2. #threatened
3. #resumption
4. #merchant
5. #world
6. #unarmed
7. #sinking
8. #wilson
9. #became
10. #french
11. #decision
12. #united
13. #primary
14. #passenger
15. #submarine
16. #motivation
17. #states
18. #diplomatic
19. #sever
20. #ships
21. #sussex
22. #following
23. #channel
24. #germany
25. #attacks
26. #english
27. #march