Replies

An example of Jefferson writting in French, citing Vattel (multiple times in the book).

Thomas Jefferson (Secretary of State) to Mr. Genet, Plenipotentiary of France - Philadelphia June 17 1793

You think Sir, that this opinion is also contrary to the law of nature, and usage of nations. We are of opinion it is dictated by that law and usage; and this had been very maturely enquired into before it was adopted as a principle of conduct. But we will not assume the exclusive right of saying what that law and usage is. Let us appeal to enlightened and disinterested judges. None is more so than Vattel. He says

1. 3, f. 104 Tant qu un pcuple neutre veut jouir surement de cet etat il doit mon trer en toutes chofcs une exacte impartialite entre ceux qui se font la guerre Car s il savorlse Pun au prejudice de Pautre il ne pourra a pas se plaindre quand celui ci le traitera comme adherent et associe de son ennemi Sa neutralise seroit une neutralise frauduleuse dont personne ne veut etre la dupe Voyons done en quoi consiste cette impartialite qu un pcuple neutre doit garder
...

Pg. 29.

A message of the President of the United States to Congress relative to France and Great-Britain : delivered December 5, 1793, with the papers therein referred, to which are added the French originals.
Thomas Jefferson - 1793. Philadelphia : Published by order of the House of Representatives, Printed by Childs and Swaine