Answer:
As Russia had guaranteed Serbia to protect them from Austrian threats, later Russian Empire would declare war on the Austrian-Hungarian Empire. Then Germany had upheld its end of the bargain by being in an alliance with Austria-Hungary and declared war on Russia and France since France was allied with Russia. Later then Britain would declare war on Germany for invading neutral Belgium. After that the Kingdom of Italy would join the Entente and declare war on Austria-Hungary.
Explanation:
Answer: Because It was the world's first historically verifiable revolution in agriculture. The Neolithic Revolution greatly narrowed the diversity of foods available, resulting in a downturn in the quality of human nutrition. The Neolithic Revolution involved far more than the adoption of a limited set of food-producing techniques.
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Between 1965 and 1968, the Vietnam War was fought primarily in the jungle.
The Vietnam War constituted a long, and costly conflict that pitted the communist government of North Vietnam against South Vietnam and its main ally, the United States.
It was the second of the Indochina Wars and was officially fought between North Vietnam and South Vietnam.
The Vietnam War claimed the lives of more than than 3 million people from which more than half were Vietnamese civilians.