History of Thanksgiving Day in the United States

Target Language or Knowledge:

Which of the countries below celebrate Thanksgiving Day? (check all that apply)
United States, Canada
What is the primary purpose of Thanksgiving Day?
Give thanks for the harvest and year.
When is Thanksgiving Day celebrated in the United States?
Fourth Thursday in November
What year was the first thanksgiving in the US purportedly held?
1621
Is Thanksgiving Day a national holiday in the United Kingdom?
No
Which US President proclaimed the first nation-wide thanksgiving celebration?
George Washington
Which US President declared Thanksgiving Day a national holiday?
Abraham Lincoln
Which animal does the US President "pardon" during thanksgiving? A ________ .
turkey