BC & AD — The idea to count years from the birth of Jesus Christ was first proposed in the year 525 by Dionysius Exiguus, a Christian monk. Standardized under the Julian and Gregorian calendars, the system spread throughout Europe and the Christian world during the centuries that followed. AD stands for Anno Domini, Latin for "in the year of the Lord", while BC stands for "before Christ".
CE stands for "common (or current) era", while BCE stands for "before the common (or current) era". These abbreviations have a shorter history than BC and AD, although they still date from at least the early 1700s.
An important reason for adopting BCE/CE is religious neutrality. Since the Gregorian calendar has superseded other calendars to become the international standard, members of non-Christian groups may object to the explicitly Christian origins of BC and AD. Particularly problematic is AD ("in the year of the Lord"), and its unavoidable implication that the Lord in question is Jesus Christ.
Religious neutrality was the main rationale behind Jewish academics’ adoption of BCE/CE over a century ago, and continues to be its most widely cited justification. However, others object to the BC/AD system on the basis that it is objectively inaccurate. It is widely accepted that the actual birth of Jesus occurred at least two years before AD 1, and so some argue that explicitly linking years to an erroneous birthdate for Jesus is arbitrary or even misleading. BCE/CE avoids this inaccuracy since it does not explicitly refer to the birth of Jesus, removing some of the baggage associated with our dating system while also acknowledging that the starting point for 1 CE is essentially a convention.
Human Pre-History — Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins c. 3.3 million years BC and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared c.3,000 BC.
The Colonial Period — Some commentators identify three waves of European colonialism. The two main countries in the first wave of European colonialism were Portugal and Spain. The Portuguese started the long age of European colonization with the conquest of Ceuta, Morocco in 1415
The second wave of European colonialism commenced with Britain's involvement in Asia in support of the British East India Company.
The third wave ("New Imperialism") consisted of the Scramble for Africa regulated by the terms of the Berlin Conference of 1884–1885.
Only fourteen 20th century independent countries escaped formal colonization by European powers: Afghanistan, Ethiopia, Bhutan, China, Iran, Japan, Liberia, Mongolia, Nepal, North Korea, Saudi Arabia, South Korea, Thailand, and Turkey as well as North Yemen.
The Industrial Age — The Industrial Age is a period of history that encompasses the changes in economic and social organization that began around 1760 in Great Britain and later in other countries, characterized chiefly by the replacement of hand tools with power-driven machines such as the power loom and the steam engine, and by the concentration of industry in large establishments.
The Information Age — It is commonly believed that the Industrial Age was supplanted by the Information Age in the late 20th century A.D., a view that became common after the Revolutions of 1989, when much of the Third World economy was still based on manufacturing, although mobile phones were commonplace even in the poorest of African countries, enabling access to global information networks. Even though many developing countries remaind largely industrial, the Information Age was increasingly on the ground by the late 20th century. The Information Age was also characterized by the digitalization of information and communication systems, and the widespread adoption of computing devices — personal, mainframe, and embedded systems. It encompasses the era in which information and data are produced, shared, and accessed at an unprecedented rate due to the proliferation of computers, the internet, and other technological innovations.
The Great Declension — The Great Declension was set off on July 2nd, 2080 CE, by intercontinental and space-based missile attacks that sparked World War III. Approximately 5% of the world's nine billion humans were killed in the initial blasts. That figure rose to 50% in the next several months, due to radiation sickness and the violence of societal anarchy that predictably ensued. By March 1, 2081, 4.5 billion people comprised the totality of humanity on planet earth.
Conventional warfare among survivors of the nuclear holocaust took place from July 3rd, 2080 to Feb 16, 2082, CE, lowering the Earth's human population to 3.8 billion by October 22, 2082 CE. Global production, relations, the sciences, and other areas declined rapidly. In Europe and North America hardened subterranean bunkers were employed by surviving leadership and by some of the formerly most affluent or influential individuals, while many other survivors drew together in enclaves in the least affected regions — which included the Rocky Mountains, the Swiss Alps, the Everglades, and other areas in South America and Eurasia.
This great decline continued through the remaining decades of the 21st century and the first half of the 22nd century. International trade slowed to a crawl, space programs were moth-balled, medical care in many areas reverted to that of earlier centuries, due to a shortage of infrastructure and pharmaceuticals.
The Cumerian Age — to be added...
The New Ice Age — to be added...
The Post-Diluvial Age — to be added...