Thousands of sites remain from the two centuries that separated the industrial revolution from de-industrialisation at the end of the 20th century: abandoned coalmines and steelmills, empty textiles factories and town gas works.
But by the end of the 20th Century the Welsh coal industry had dwindled from its former strength.
Some explanations appear more valid than others, but none fully clarifies why multinationals have become so prominent at the end of the 20th century.
But by the end of the 20th Century, they could not compete with the cheap bears imported from China and most of them closed down.
Indeed, as Greece's politics turned increasingly republican and populist at the end of the 20th century, interest waned in heroes, royal tombs and literary sources such as Homer's epic poems.
But it's still slack and amateurish, and unless you have an all-consuming interest in what the newspaper business was like at the tail end of the 20th century, it's hard to see how "Lucky Guy" comes anywhere near passing the who-cares test.
But the chief editor of Ex-Libris insists that, in fact, at the end of the 20th century, the two have a lot in common.
We have come a long way since the notion of heroism that prevailed at the tail end of the 19th century and the beginning of the 20th.
The discovery of the Higgs last year was the end of a successful chapter of late 20th Century physics.
It was a cue for the families who had left London's East End in the middle of the 20th Century to move on again at the start of the 21st.
By the end of his life in 1991, Miles Davis was widely acknowledged as one of the most influential musicians of the 20th century.
In the U.S., where the 19th-century (and turn-of-the-20th) dominates the high-end market, pieces that are signed by certain makers or artists typically command the top prices.
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