Final answer:
The two declines in population in the middle of the period shown above correspond to the great famine and the black death.
Step-by-step explanation:
The two declines in population in the middle of the period shown above correspond to the great famine and the black death. Between 1300 and 1500, Europe experienced a series of catastrophic events, including famine, war, and the bubonic plague, which caused a significant decrease in the population. The Black Death, which occurred from 1347 through 1350, killed approximately a third of the European population. These events had profound impacts on the social, economic, and political landscape of Europe during the Late Middle Ages.