Mountains made it hard to find flat land.
Tension had been growing between the European countries for sometime. Four causes that lead to the 'Spark' of the war were: Nationalism, Militarism, the causes that lead to the 'Spark' of the war were: Nationalism, Militarism, the Alliance-System, and Imperialism. On June 18, 1914, The Black Hand, and members of British and French Intelligence assassinate Franz Ferdinand, the archduke of Austria-Hungary. This sparks WW1. Outraged, Austria-Hungary wages war against Serbia. Thanks to the Alliance system, Austria drags Germany, (who wrongfully <span>took the blame for the war), into the war. Serbia drags Russia into the war, making it a World War</span>
Answer:
<em>New food and fiber crops were introduced to Eurasia and Africa, improving diets and fomenting trade there. In addition, the Columbian Exchange vastly expanded the scope of production of some popular drugs, bringing the pleasures — and consequences — of coffee, sugar, and tobacco use to many millions of people.</em>
