Answer:
An estimated total of 70–85 million people perished
Internationalism is raising awareness of human rights issues and environmental
isolationism is someone getting involved in a country and helping spread peace in the country
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<span>1. Archduke Franz Ferdinand is assassinated in Sarajevo.
2. </span><span>Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities.
3. </span><span>Germany invades Belgium, beginning World War I.
4. </span><span>A German submarine sinks the passenger liner </span>Lusitania<span>. The ship carries 1,198 people, 128 of them Americans.
5. </span><span>The British employ the first tanks ever used in battle, at Delville Wood. Although they are useful at breaking through barbed wire and clearing a path for the infantry, tanks are still primitive and they fail to be the decisive weapon, as their designers thought they would be.
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