There are fifty States in the union, but with our bicameral legislature, each individual State, no matter, how big, or no matter how small, are entitled to exactly two Senators in the Senate, whereas in the Congressional branch of legislature, the amount of representatives is population based, though, each State no matter how small, is still entitled to at least one congressional representative.
The core of New England consists of these six States which are: Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, and Connecticut, of which four of those States, despite their very early admittance to the United States, rank amongst the ten smallest populated States in the nation. Then, there are another five States, that are in the Northeastern portion of America, which are: New York, New Jersey, Delaware, Maryland, and Pennsylvania, of which Delaware is also a State whose population ranks in the bottom ten of all States in America, so that, out of these eleven States, all located in the Northeastern part of America, five of these States are in the bottom ten in regards to population.
Not only is a significant portion of the Northeastern states small in population, but, the seven smallest States in land area of this union, are also in the Northeast. This means, when it comes to the Senate, of our bicameral legislature, that small States in physical as well as population size have far more legislative power than other States in the union. Further to the point, geography most definitely matters, so that, back in the era after World War II, and well into the sixties, when this country was liberalizing itself in regards to civil rights, the southern States united in delaying and precluding the ratification of such civil rights, because these States all had a common ground to defend, despite the injustice of what they were defending.
So too, whether good or bad, the northeastern States in their quantity, eleven out of fifty, which is 22% of the Senate, have a voice that often, though not always, represents the northeastern interests which may be at odds to the betterment and the good of the United States as a whole, for representatives of each State, have a tendency, to want to placate and to help their own geographical residents first, before the consideration of this country as a whole.
Keep in mind that Rhode Island, the tiniest State in the union, could fit into Texas, about 200 times, though each of these respective States, has exactly the same amount of United States Senators, two. Though the bicameral legislature was made part of the Connecticut Compromise at the Constitutional convention, it clearly is undemocratic in its effect, as States with small populations have an outsized impact in regards to Senate legislative matters. Further, the fact that Senators are elected to six year terms, as compared to Congressional terms of just two years, provides Senators with even more implicit power, for lobbyists of all sorts, prefer to work with the bird in hand, rather than having to re-introduce themselves to new congressional representatives that are vulnerable to not being re-elected every two years.
While there isn't necessarily anything wrong with each State having exactly two Senators, it is not a coincidence, that America did not create any more small continental States as it expanded out west, for those small northeastern States, understood well that their continual outsized legislative power depended upon that very principle.