According to his journals, why does John Quincy Adams believe that prohibiting slavery in the

western territories is, in fact, constitutional?

The ideals of the nation are set forth in the introduction to the United States Constitution, and they include justice. Therefore, because slavery is unjust, the leaders of the nation have every right to prevent its spread into new territories

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know