When and how did other developments of the 1850s heighten sectional tensions

During the 1850s, tensions between the North and South increased as the nation decided to how to incorporate the vast territories that had been acquired during the Mexican-American War of 1846-1848. The question of whether each territory was to be slave or non-slave worsened sectional tensions.

where is the picture

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