The correct answer to this open question is the following.
You forgot to include the choices of the questions. Without the choices, we do not have references. However, hope we can help with the following comments.
Jus ad bellum is the kind of legislation that authorizes the transition from a state of peace and agreement to a state of war, where the use of the armed forces is justified. It implies that just a legitimate authority can wage war when no other option is left. Just ad bellum have some principles, that include: right authority, right intention, proportionality, reasonable hope, and last intention, which can be understood as the case in which war is the last resource after a long period of diplomacy and negotiation, under the right authority and the valid reasons to proceed as the last resource to solve an issue.
The transatlantic slave trade was really a triangle. Here's a map to show the approximate routes. The trade was brought about to benefit the economy of Caribbean nations and Europe. The slaves were forced into awful conditions; cramped boats and harsh climates with which to toil away picking cotton or whatnot.
The middle of a see-saw, opposing forces cancel each other out.
Generally speaking, after <span>world war 2 many Americans shifted to "white collar work," since the need for large-scale factory production had largely diminished. </span>
