What is an economy? (adding this for extra letters cuz apparently your question has to be 20 characters long)

An economy is a system of making and trading things of value. It is usually divided into goods (physical things) and services (things done by people). It assumes there is medium of exchange, which in the modern world is a system of finance. This makes trade possible. Economics is the study of how societies use scarce resources to produce valuable commodities and distribute them among different people. ... Indeed, economics is an important subject because of the fact of scarcity and the desire for efficiency.

Explanation:

Examples:  The traditional economy that encompasses the customs and history of a nation to guide production and distribution of goods. Traditional economies are mostly based on agriculture, fishing, and hunting.

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world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.