Feudalism was a very simple system, the most dominant and effective during medieval times. The feudal system was considered to be the most effective for the time because, under this system, the king had complete control and the guarantee of greater security. This system helped to build the structure of society around relationships that allowed vassals to have a piece of land in exchange for military protection and loyalty given to the king and lords.
If you're talking about G.I. generations then the answer is about 4
It reminded people that a nuclear war would be devastating for everyone.
When Jefferson died in 1826, the nation stood on the threshold of a stupendous transformation. During the ensuing quarter century it expanded enormously in space and population. Commerce flourished and so did agriculture. The age witnessed the rise of the common man with the right to vote and hold office. It was a time of overflowing optimism, of dreams of perpetual progress, moral uplift, and social betterment. Such was the climate that engendered the common school. Open freely to every child and upheld by public funds, it was to be a lay institution under the sovereignty of the state, the archetype of the present-day American public school. Bringing the common school into being was not easy. Against it bulked the doctrine that any education that excluded religious instruction—as all state-maintained schools were legally compelled to do—was godless. Nor had there been any great recession of the contention that education was not a proper governmental function and for a state to engage there was an intrusion into parental privilege. Even worse was the fact that public schooling would occasionally rise in taxes.
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-Silver
The Quakers founded Pennsylvania