Answer:
Trench warfare in World War I was employed primarily on the Western Front, an area of northern France and Belgium that saw combat between German troops and Allied forces from France, Great Britain and, later, the United States. Although trenches were hardly new to combat: Prior to the advent of firearms and artillery, they were used as defenses against attack, such as moats surrounding castles. But they became a fundamental part of strategy with the influx of modern weapons of war.
Long, narrow trenches dug into the ground at the front, usually by the infantry soldiers who would occupy them for weeks at a time, were designed to protect World War I troops from machine-gun fire and artillery attack from the air. As the “Great War” also saw the wide use of chemical warfare and poison gas, the trenches were thought to offer some degree of protection against exposure. (While significant exposure to militarized chemicals such as mustard gas would result in almost certain death, many of the gases used in World War I were still relatively weak.)
Explanation:
The Industrial Revolution changed the economy as it created more jobs, increased trade, and raised prices and lowered salary's. The Industrial Revolution opened a window for large business companies and factories for many, but factory life was very harmful and paid little to none. Thus requiring families to have children work just to have enough income for basic necessities. Trade was on the rise as goods were manufactured swiftly and efficiently.
The Industrial Revolution changed society as it caused urbanization, decreased safety, caused huge overcrowding and pollution. During the Industrial Revolution, safety within factories was not a priority and many workers were harmed or killed in work. Overcrowding occurred as many had to move from rural to urban areas to get jobs, thus crowding in slums and tenants. Pollution, specifically air and water pollution, was on the rise as smoke from factories increased green house gases and factories dumping out sewage in open bodies of water polluted the water.
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Some examples of Post-Impressionist characteristics are bright colors, art made purposely for the artist's sake, and expressiveness. I hope this helps.
People traveled freely between east and west Germany.