so the world can be a better place, it's different now
It is noted that now 27 countries of the world peg their currencies to EURO. So the answer is EURO.
World War 1 because as Taskmasters said on this website, "Dadaism was an art movement of the European avant-garde, in the early 20th century, which was heavily influenced by World War I. It was anti-war and anti-bourgeois, and had political affinities with radical left. Some of the key figures of the Dada movement were: Hugo Ball, Emmy Hennings, Hans Arp, George Grosz, Max Ernst, Beatrice Wood, Tristan Tzara, Francis Picabia, etc. The movement influenced later styles in art such as Surrealism, Nouveau Realisme, pop art and Fluxus." (I quoted another guy's answer a.k.a. Taskmasters.
From 284 to 305, Diocletian ruled as the Roman emperor. He oversaw significant improvements in the empire throughout his rule.
By dividing and enlarging the civil and military services as well as the provincial divisions, Diocletian established the largest and most bureaucratic government in the history of the empire. Diocletian appointed the consuls, stopped the senators from collaborating to draft laws, divided the imperial counselors among specialized offices, defined their roles to limit the power of the praetorian prefects (the emperor's personal bodyguards), specialized administrative work, and increased the number of bureaucrats. Additionally, the earlier command was provided and the army was reorganized. He released soldiers from active duty after 20 years of service, and the military benefited most when he put a price cap on items to cut the cost of living. Two new taxes, the jugum, and the capitatio, were enacted. The former was a tax on a parcel of arable land, whilst the latter was a charge on individuals. This adjustment was accompanied by a monetary reform. In 303–304, Diocletian issued the four edicts while vowing to refrain from any atrocities.
Diocletian reformed the empire without resorting to political idealism. His reforms weren't the outcome of a preconceived plan; rather, they were enacted as a result of historical necessity.
Learn more about Diocletian here
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