This lesson is designed to take at least 90 minutes, either in one block of time or two separate 45-minute blocks. The extension activities included could easily take this core lesson to a week-long mini-unit.Focus on critical thinking skills and exploring various points of view on the popular topic of the first Thanksgiving. This multi-grade lesson plan comes complete with extension activities and a resource guide. What really happened at the very first Thanksgiving? Look at accounts from the E