I appreciate that you're upfront about this being a research paper, it really helps us to structure our answers!

I would argue that the key difference is in a shared culture created by the easy spread of information within the British North American colonies, while the Spanish and Portuguese colonies did not have this advantage.

The British North American colonies occupied a single strip of land that ranged from Georgia to what is today Maine. This expanded to include Florida and Canada for a brief period from 1763 until American independence. This fairly confined space, hemmed in by the Appalachian mountains to the West and the Atlantic to the East, concentrated colonial development to an easily navigable region that fostered the spread of information.

The Central and South American colonies, however, were far far larger than the British. At that, the distance between colonial capitals was often tremendous, and travel between them far more difficult.

The spread of information wasn't simply geographic. I would highly recommend that you look up some eighteenth century newspaper of British North America. There's a number of them freely available online, including the Virginia Gazette through Colonial Williamsburg. You'll notice that these papers often begin with sections on news from the European continent, with a particular focus on Britain, before a "domestic intelligence" section. It is most often only after these sections that local news is related. Priorities of colonial British readers may be demonstrated through the order in which printers thought they wanted to read stories. There's an emphasis on British news, then on news from their fellow colonies. This created a shared culture of information, which facilitated the communication network that would become so essential in the Revolution.

White American colonists had surprisingly high literacy rates, and you may want to compare those rates to what they would be among common Spanish and Portuguese colonists.

Good luck!