There were many more than three but the three main ones are the assassination of Archduke Franz Ferdinand, the rise of Nationalism, and the building up of military and alliances.
As China became industrialized, more and more smoke and smog went into the air causing air pollution, increasing the chance of asthma and other lung diseases.
Answer:
A free good is a good that is not scarce, and therefore is available without limit. A free good is available in as great a quantity as desired with zero opportunity cost to society. A good that is made available at zero price is not necessarily a free good.
Explanation:
I’m pretty sure the 2nd one