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CENTERFORSECURITYPOLICY: Center For Security Policy

It is understood the enclosure was built during the early Neolithic period (3800 BC to 3600 BC).

BBC: Truro experts uncover '6000-year-old' causeway

And so, of course, there is a set of tools that are well understood, and there is always, in any time period, readiness.

WHITEHOUSE: Press Briefing

That led to 1970s postmodernism, less a period of creative vitality than of confusing signals and flawed buildings, a half-understood historical recall supposedly leavened with irony in the way past and present were combined.

WSJ: When the Outrageous Became Mainstream