World War I completely changed the way wars were fought.
Trench warfare, which was the norm just a century ago was seen as an nonviable strategy.
Modern machines such as tanks and airplanes made trench warfare mostly about keeping ground and resulted in stalemates.
Also, it was the first time that modern tanks, planes and machine guns were being used for first time at such a large scale, resulting in an unprecedented level of death and carnage.
Military generals soon realized that time-honored military code of conducts were now obsolete and a completely new form of strategy was now required.
<span>Manufactured goods is the correct answer. On the journey from Europe to West Africa as part of the Slave Triangle or the Trans-Atlantic Slave Trade, ship owners would bring goods from Europe to Africa to trade for slaves, such as goods from France.</span>
