World War I was fought by soldiers and laborers who supported the war efforts making goods needed for the war effort. Where were many of the soldiers and laborers from? Select the best answer. Question 8 options: Europe and the United States. Britain, France, Serbia, the United States, and Canada. Europe, the United States, Canada, India, Nigeria, New Zealand, Australia, French Colonial Africa, French Indochina, Russia, Siberia, Central Asia, and China. Europe, the United States, Canada, and Africa.