The Pilgrims landed in the future state of Massachusetts on December 1620. So they missed that year's harvest. Thanksgiving was an outgrowth of the widespread celebration of thanks for the harvest throughout many places and times. That celebration therefore was held the following year, in 1621.
yes
1621
no
no they didn't
1692
In the fall of 1621
In November.
pilgrims
because pilgrims celebrated it too.
yes pilgrims and Indians invented thanksgiving together
The Pilgrims decided to hold a celebration of Thanksgiving. They invited the Wampanoag, who had helped them survive a very difficult year.to celebrate the great harvest that year