Hillary Clinton did not write her forthcoming memoir, "Hard Choices," for Washington, she explains in an author's note released Tuesday by her publisher, the second excerpt to be released from the book.

"While my views and experiences will surely be scrutinized by followers of Washington’s long-running soap opera — who took what side, who opposed whom, who was up and who was down — I didn’t write this book for them," Clinton writes. "I wrote it for Americans and people everywhere who are trying to make sense of this rapidly changing world of ours, who want to understand how leaders and nations can work together and why they sometimes collide, and how their decisions affect all our lives."

Clinton also might have written the book, set to be released June 10, as a precursor to a second presidential campaign, a path she has acknowledged she is considering for 2016. Should Clinton run for president, her memoir will offer an important defense of her tenure as secretary of state, and will likely frame some of her key foreign policy positions moving forward.

In the excerpt released Tuesday, Clinton hints that among the themes she will tackle is that of American involvement on the world stage and the extent to which intervention is appropriate or necessary. By reaffirming the United States as an "indispensable nation," Clinton draws somewhat of a contrast with some potential Republican presidential candidates, such as Sen. Rand Paul, R-Ky., who have called for a pared-back U.S. presence abroad.

"While there are few problems in today’s world that the United States can solve alone, there are even fewer that can be solved without the United States," Clinton writes.

To promote the book, Clinton plans to embark on a media blitz and a nationwide book tour -- valuable practice for the rigors of a political campaign, should she choose to launch one.

And, in her latest excerpt, Clinton hints that that future choice might not be the hardest she's made.

"One thing that has never been a hard choice for me is serving our country," Clinton concludes in the author's note. "It has been the greatest honor of my life."