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Answer:
Guilds: they are medieval association of workers and craftsmen which ensure mutual aid and quality work in a particular production process in which they hold a monopoly acquired from the state.
During the mid-eighteenth century, they became the center of criticism by the followers of free trade who believed that restriction of work by the sate should be ended for a more competitive economic structure. By the mid-nineteenth century, the monopoly of guilds seemed to be disappeared.
His assassination gave Austria-Hungary a reason to declare war on Serbia, at which point alliances began to pull countries into the war (WWI) one by one.