The concrete building developed in the 1800s allowed Gustav Eiffel to erect the world's tallest structure in Paris, in 1889.
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.
D. Spices and Silk
That is most likely the correct answer
The best answer is A) <span>He pushed for social reform
Voltaire was a humanist philosopher from France, who believed in natural human rights and greater participation of the people in government, similar to the ideas of the Founding Fathers in the US. </span><span />