Lewis and Clarke. Sacajawea was a translator for the people speaking with the tribes.
Here’s something that may help: https://study.com/academy/answer/what-effect-did-the-final-solution-have-on-the-population-of-eastern-europe.html
4. because if other countries deny what happened they do not learn from it and it can happen again 5 look for facts do your own resheach and don't take any information for granted (too late lol)