Ameliorate the Mayflower Compact

Directions: students should grammatically correct the sentences below, in red. There are two sentences, 

The Mayflower Compact was signed by the Pilgrims aboard the Mayflower on November 11 1620 it was the first governing document of Plymouth Colony.

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suggested answer:
The Mayflower Compact was signed by the Pilgrims aboard the Mayflower on November 11, 1620.  It was the first governing document of Plymouth Colony.