Final answer:
The words on the left that led to WWI can be understood by examining the political, economic, and social factors of the time. The system of alliances, competition for colonies, rising nationalism and militarism, and the assassination of Archduke Franz Ferdinand were key factors.
Step-by-step explanation:
The words on the left that led to WWI can be understood by examining the political, economic, and social factors of the time. One of the main causes was the system of alliances between countries, such as the Triple Entente and the Triple Alliance, which created a complex web of obligations and commitments.
Additionally, the competition for colonies and resources, as well as rising nationalism and militarism, contributed to tensions between nations. The assassination of Archduke Franz Ferdinand of Austria-Hungary by a Serbian nationalist was the immediate trigger that led to the outbreak of the war.