Short answers, pulled from the story.
The first anatomically modern humans arrived in Europe approximately 45,000 years ago. These pioneers brought a culture that eventually displaced the Neanderthals who had inhabited the continent for hundreds of thousands of years.
The Mycenaean civilization perished with the collapse of Bronze Age civilization on the eastern shores of the Mediterranean Sea. This decline is commonly attributed to the Dorian invasion, though theories of natural disasters and climate change also exist.
The Western Roman Empire fell in 476 AD when Romulus Augustus surrendered to the Germanic King Odoacer. This event left a power vacuum that allowed for the rise of new powers including the Franks, the Visigoths, and the Ostrogoths.
The Black Death occurred during the Late Middle Ages spanning the 14th and 15th centuries and killed people in a matter of days. Depopulation caused labor to become scarcer, allowing survivors to be better paid and peasants to drop some of the burdens of feudalism.
The Industrial Revolution started in England and Scotland in the mid-18th century. Major changes in agriculture, manufacturing, and transport impacted Britain and subsequently spread to the United States and Western Europe.
The Soviet Union came to an end in 1991, marking the beginning of a new era for the continent. After the Revolutions of 1989, all European communist states transitioned to capitalism and most former communist states gradually joined the EU.