Beginning in 1350, a major drop occurred in the English population. The primary cause for this drop was

The primary cause for this drop was the plague (the Black Death). In those times, when hygiene education was not developed and health systems not available, there was no cure, and very few people survived it. It was highly contagious, so many people got it. By 1400. the population of England was reduced by the half.

The Black Death was the major cause of the population decline