People began to rely on agriculture. And, organizing agriculture led to the development of political organization. Women's role in society became more domestic as men began to do the farmwork. When there was surplus agricultural production, other occupations like artisans and merchants came up.
They are all connected. You need an education so you can become employed in a career and then you make an income from that career.
The two ideas of total war was used because the countries against each other where angry with each other and It was one of the deadliest conflicts in history and precipitated major political change, including the Revolutions of 1917–1923 in many of the nations involved. Unresolved rivalries at the end of the conflict contributed to the start of the Second World War twenty-one years later. They wanted to end conflict. The second reason was that each country wanted more power. It was a "war to end all wars" But it never ended all wars since World War II Came around the corner twenty-one years later.
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~Hope this helps
Image result for The French Revolution (1789) began as a reaction to
The French Revolution began in 1789 and lasted until 1794. King Louis XVI needed more money, but had failed to raise more taxes when he had called a meeting of the Estates General. This instead turned into a protest about conditions in France.
Cited: https://www.nationalarchives.gov.uk/education/resources/french-revolution/
There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
