How might the effectiveness of the League of Nations contribute to the
start of WWII?

Their efforts to keep peace ended in more bloodshed

Explanation:To ensure that nothing as terrible as World War I ever happened again, the Allied Powers created the Treaty of Versailles and then the League of Nations in order to maintain peace. However, these did not work well, and this in conjunction with the Great Depression caused Germany to become an aggressor. Appeasement in Europe allowed it to continue until finally, Germany’s behavior could no longer be tolerated. Therefore, the failure of the League of Nations was the primary cause of World War II because it led to a series of events that triggered German aggression, ultimately causing World War II.

states began imposing duties on each other's goods. congress had no way to raise money for an army to expel them.

d.

the northwest territory became the most densely populated area in the u.s.