Answer:
A - Alliances caused more and more countries to join the war
Explanation:
https://alphahistory.com/worldwar1/alliances/
To sum it up, Germany and Austria-Hungary where allies. There alliance was called the Central Powers. Serbia was a friend of Russia, so when Austria-Hungary invaded, Russia joined the war against the Central Powers. Russia was allied to France. Germany wanted to take out France fast and then focus on Russia. They went around the French border and invade Belgium. Belgium independence was guaranteed by the United Kingdom thus pulling them in the war.
Answer: The black gold, in 1859, when Edwin L. Drake was able to drill oil with the used of steamed engine
Explanation: Your Welcome!
The effect did overgrazing have on Afro-Eurasian grounds is that it made the terrains go dry, which made individuals not have the capacity to develop trims any longer so they needed to move out of Eurasia.
99 percent of the dry prairie of Champagne was transformed into concentrated yield developing fields after World War II, making many feathered creature species vanish. This example has been rehashed in many parts of the world where human populaces are rising.
Answer:
On February 4, 19 15 , Germany declared the waters about the British Isles a "war zone" in which submarines would destroy every enemy merchant vessel found there. Britain's blockade across the North Sea and the English Channel cut the flow of war supplies, food, and fuel to Germany during World War I. Germany retaliated by using its submarines to destroy neutral ships that were supplying the Allies.
Explanation:
Hope it helps!