I'm going to stay neutral on this one. You are both my friends.
Whose side are you on USA? Pick me
I hate you!
Lets go to war!!!
No pick me!
US Neutrality Violations
How dare you!
I am not letting you trade with France.
When the US had to choose between Great Britain and France's sides, they chose to be neutral and not pick a side. This is so that they did not have any conflicts with the other country and they did not want to upset the other side since both sides had good relation with the US.
Both the French and the English would seize US ships to prevent them from trading with their enemy. Jefferson, being a peaceful guy, did not declare war from this.