The Bubonic Plague (a.k.a The Black Plague) caused a dramatic decline in the population of Europe in the 1300s.
population would decline
The plague, and wars.
black death (plague) and crusades
The short answer is: infighting and the plague.
The Black Plague, or the bubonic plague, caused widespread death across Europe during the 14th century, leading to a significant decline in population. This resulted in abandoned villages and farmlands, which in turn led to a shift in land use patterns and a disruption of trade routes. The reduced population also impacted urbanization and influenced the overall demographic landscape of Europe.
The Plague
The End Of War. The end of the plague. The decline of famine
A lull in fighting between countries and by the decline of famine and the plague.
When People died of the Plague, the other people could get increased pay because there would be less people.
Their military defeat & their loss in the Peloponnesian War. Sparta burned all of the Athenian food supply and a plague also occurred in Athens which killed 1/3 of the population.
One third of the population died from the plague which was about 25 million persons.