Final answer:
Half of the Pilgrims died during the first three months after landing at Plymouth, facing a harsh winter with inadequate supplies.
Step-by-step explanation:
During the first three months at Plymouth, one half of the Pilgrims died. The Pilgrims faced a harsh winter and suffered from a lack of provisions after spending time exploring rather than preparing. Despite the significant loss, including the death of Governor Carver, the determination of the Pilgrims was strong. When the Mayflower sailed back to England in April 1621, none of the survivors left with it, choosing instead to stay and continue their efforts in the New World.