Step 1 : Introduction to the question "What New England landmark was buried in sand on Thanksgiving Day in 1970, during a demonstration by Indian activists?"
...Plymouth Rock has figured prominently in American Indian politics in the United States, particularly as a symbol of wars starting with King Philip's War (1675–78), known as the First Indian War. It has been ceremoniously buried twice by Indian rights activists, once in 1970 and again in 1995, as part of National Day of Mourning protests.
