Societal collapse in the context of "United Kingdom of Great Britain and Ireland"

The Late Bronze Age collapse was a period of societal collapse in the Mediterranean basin during the 12th century BC. It is thought to have affected much of the Eastern Mediterranean and Near East, in particular Egypt, Anatolia, the Aegean, eastern Libya, and the Balkans. The collapse was sudden, violent, and culturally disruptive for many Bronze Age civilizations, creating a sharp material decline for the region's previously existing powers.

The palace economy of Mycenaean Greece, the Aegean region, and Anatolia that characterized the Late Bronze Age disintegrated, transforming into the small isolated village cultures of the Greek Dark Ages, which lasted from c. 1100 to c. 750 BC, and were followed by the better-known Archaic Age. The Hittite Empire spanning Anatolia and the Levant collapsed, while states such as the Middle Assyrian Empire in Mesopotamia and the New Kingdom of Egypt survived in weakened forms. Other cultures, such as the Phoenicians, enjoyed increased autonomy and power with the waning military presence of Egypt and Assyria in West Asia.

The Crisis of the Late Middle Ages was a series of events across Europe during the late Middle Ages. These events involved extensive demographic collapse, political instability, and religious upheaval. Collectively, they marked an end to a centuries-long period of relative stability in Europe, and reshaped regional societies. This crisis period coincides with a shift in the regional climate from the Medieval Warm Period to the Little Ice Age.

The events of the Crisis include the Great Famine of 1315–1317 and the Black Death of 1347–1351, which caused very high mortality across the region. Population did not rise to pre-crisis levels until around 1500.

The Decline of the West (German: Der Untergang des Abendlandes; more literally, The Downfall of the Occident or even more literally, "The Going-Under of the Evening Lands") is a two-volume work by Oswald Spengler. The first volume, subtitled Form and Actuality, was published in the summer of 1918. The second volume, subtitled Perspectives of World History, was published in 1922. The definitive edition of both volumes was published in 1923.

Spengler introduced his book as a "Copernican overturning"—a specific metaphor of societal collapse—involving the rejection of the Eurocentric view of history, especially the division of history into the linear "ancient-medieval-modern" rubric. According to Spengler, the meaningful units for history are not epochs but whole cultures which evolve as organisms. In his framework, the terms "culture" and "civilization" were given non-standard definitions, and cultures are described as having lifespans of about a thousand years of flourishing, and a thousand years of decline.

Apocalypticism is the religious belief that the end of the world is imminent, even within one's own lifetime. This belief is usually accompanied by the idea that civilization will soon come to a tumultuous end due to some sort of catastrophic global event.

Apocalypticism is one aspect of eschatology in certain religions, the part of theology concerned with the final events of human history, or the ultimate destiny of humanity (societal collapse, human extinction, and so on).

Henry VI, Part 3 (often written as 3 Henry VI) is a history play by William Shakespeare believed to have been written in 1591 and set during the lifetime of King Henry VI of England. Whereas 1 Henry VI deals with the loss of England's French territories and the political machinations leading up to the Wars of the Roses and 2 Henry VI focuses on the King's inability to quell the bickering of his nobles, and the inevitability of armed conflict, 3 Henry VI deals primarily with the horrors of that conflict, with the once stable nation thrown into chaos and barbarism as families break down and moral codes are subverted in the pursuit of revenge and power.

Although the Henry VI trilogy may not have been written in chronological order, the three plays are often grouped together with Richard III to form a tetralogy covering the entire Wars of the Roses saga, from the death of Henry V in 1422 to the rise to power of Henry VII in 1485. It was the success of this sequence of plays that firmly established Shakespeare's reputation as a playwright.

Nuclear warfare, also known as atomic warfare, is a military conflict or prepared political strategy that deploys nuclear weaponry. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear warfare can produce destruction in a much shorter time and can have a long-lasting radiological result. A major nuclear exchange would likely have long-term effects, primarily from the fallout released, and could also lead to secondary effects, such as "nuclear winter", nuclear famine, and societal collapse. A global thermonuclear war with Cold War-era stockpiles, or even with the current smaller stockpiles, may lead to various scenarios including human extinction.

To date, the only use of nuclear weapons in armed conflict occurred in 1945 with the American atomic bombings of Hiroshima and Nagasaki. On August 6, 1945, a uranium gun-type device (code name "Little Boy") was detonated over the Japanese city of Hiroshima. Three days later, on August 9, a plutonium implosion-type device (code name "Fat Man") was detonated over the Japanese city of Nagasaki. Together, these two bombings resulted in the deaths of approximately 200,000 people and contributed to the surrender of Japan, which occurred before any further nuclear weapons could be deployed.