A primary source comes from a first-hand witness's point of view which makes the information from that source more valid than a secondary.
At the spring of 1774, between May and June, the so-called Intolerable Acts take place: The British Empire imposes four drastic measures to Massachusetts, removing its self-government and its independence in matters of law. This was product of the Boston Tea Party. This act prompted the 13 Colonies to reach an agreement to boycott the products of Great Britain. Then, in September of that same year, the colonial delegates met to plan and organize an opposition against the impositions of the British Empire in the Continental Congress.
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