Your answer that fills in the blank is: Social Security.
Yes, it is true that the technology and factory assembly lines of the 1900s changed American life forever, since these turned America into an industrial cornerstone of the world, which set its place in the 20th century.
Interesting document.
It was issued by the German Foreign office (January 1917) proposing that Mexico should align itself with Germany in the even America enter the war. Germany was pleading for an alliance that would keep America busy dealing with an attack from the south. Fortunately it didn't work.
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Like in medieval Europe, Japan developed a feudal system dominated by a warrior aristocracy outside of the weak central government. The emperor was the head of feudal society in name only. The shogun, the military commander, held the real power. The shogun gave lands to vassal lords, daimyo, who supported him.
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what ellaborate more and maybe i could help you!