If you're a history generalist, looking for a broad-based overview of the lives and times of our founding generation, this book will not satisfy, despite the prominence of several luminaries (Washington, Madison, Hamilton, et al). However, for those who are looking for a more targeted examination of a seminal event (really, series of events) that created the foundation of American government for the past two-plus centuries, as well as a great summation of the debates that informed the understanding of the people who gave the Constitution its legal force, and therefore its meaning.
The book's structure is chronological, and starts with the immediate aftermath of the Constitutional Convention, and the reactions around the country to that convention's work. Some were outraged that an assembly called to propose modifications to the Articles of Confederation, which almost everyone agreed needed to be fixed, came out proposing an entirely different system of government. Others were thrilled at the chance to begin anew. But the first wicket that needed to be passed was for Congress, which was the seat of government under the Articles, to submit the new Constitution to the states for ratification. This was not a huge barrier, as most representatives were pretty fed up with the impotence of Congress under the AoC. Ms. Maier then takes the story to the state conventions.
The debates of the conventions were important for a number of reasons, and since we know, in the early 21st century, the outcome of these debates, the really interesting points center on how they came out. The first few states, like Delaware, Pennsylvania and New Jersey, were all pretty gung-ho to call their conventions and ratify quickly. In fact, the treatment of the opposition in PA, which was pretty decidedly in the minority, was a major factor in the subsequent debates in Massachusetts, Virginia and New York. The leading proponents of ratification, James Wilson and Thomas McKean (both veterans of the Declaration of Independence debates and, in Wilson's case, a major architect of the Constitution itself)tended to be very condescending and disrespectful to those who were opposed, and generally didn't give the opposition's views much consideration. This created bad feelings all around, which later conventions attempted to avoid procedurally.
The structure of the book, going state by state, creates a tension that notionally shouldn't exist given that we know the outcome, but the writing was very effective in this sense. Ms. Maier gives very fair attention to the arguments on both sides, and the various written debates that proceeded the actual conventions, the town meetings that elected the representatives to the conventions, and brief-but-useful backgrounds on the major players in each debate. While folks like Madison and Hamilton pop up throughout the book as they try to keep tabs on different happenings, they really only take center stage in the conventions where they participated- and even there, only share the spotlight with well-known opponents like Patrick Henry and George Clinton. Crucially, Maier gives great attention to lesser-known (but incredibly significant) personalities like William Findley, Melancton Smith, and Rufus King.
The true impact of the structure comes in seeing how momentum to ratify in later conventions built as more states approved the Constitution, how arguments from, say the Massachusetts debate (on both sides) were borrowed, sharpened and extended in Virginia or New York, and how winning over skeptics, of which there were many, eventually required new tactics. for example, Massachusetts was the first state to ratify with "recommended" amendments, but almost all subsequent conventions adopted the practice, and many of them would likely have failed to ratify without them. Indeed, some of the greatest opponents of the new Constitution (like the aforementioned Henry and Clinton, along with future president James Monroe) did not consider them adequate, wanting the amendments to be adopted prior to ratification. The New York convention, it is clear, would almost certainly have rejected the Constitution but for the fact that ten states had already ratified, thus putting the new government into effect (it required 9 of the 13), and making the choice one of staying in the Union or being left to its own devices. Even then, it was very close, and North Carolina and Rhode Island didn't join the fold until 1789 and 1790, respectively.
The main objection to the Constitution at the time was that it gave too much power to the central government at the expense of the states, which were regarded better safeguards of liberty because they could have greater representation of the people. The arguments put forward in favor generally sought to allay these fears, and it's critically important to understand these debates, and how they were won, because too often we forget that the Revolution was fought primarily to safeguard the rights of the individual as understood in the Enlightenment era, however imperfectly practiced in the United States at the time. The chief concern of the people was a government that could become despotic, and would imagine that the people's rights came from the government, rather than pre-existing independently.
the Federalists generally sought to assure opponents that a democratic republic with limited, enumerated powers would derive all of its power from the people, and could not therefore remove their rights without being answerable to them. Nonetheless, it was generally agreed (by both sides) that some sort of Bill of Rights should be enacted to safeguard those rights against government abuses of power. As we examine the meaning of the Constitution in our own time, it worth remembering that the legal basis for the Constitution rests upon these ratifying conventions, and that their understanding of the powers granted thereunder, and their limitations, is what, like any law, binds future citizens and governments until the law is changed under the correct legislative (and Constitutional) procedure for making those changes.
Ms. Maier drives her narrative with perhaps too much detail at times, lingering on, for instance, procedural aspects of the conventions for too long, in my opinion. However, overall this book was a masterful and comprehensive look at an incredibly important juncture in the infancy of our new nation, and contained many insights that even a fairly careful student of this period will find new and refreshing. Overall, an outstanding work.