The Mayflower Compact is often cited as one of the foundations of the US Constitution. The Pilgrims in England received a land patent from the Virginia Company and created their own joint-stock company for the enterprise.
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This is true, not having a navy has shown itself to be a weakness of many nations/civilizations in the past. And there are also good reasons why this is so. Not having a navy strongly impacts a civilizations ability to maneuver around certain points and go around them. It also limits the ability to trade with other natons. Not to mention the additional value of having the firepower of ships (those that had cannons later on at least).
C. Inevitable
They were going to need to expand any way because they were running out of room on the East coast