Thanks for your patience, everyone.
I really can't tell you how much I enjoyed reading all of your comments. I put them all, including one that came in via Twitter due to Blogger issues, into a hat (literally) and the four winning names that came out of that hat were:
Kareby, who would back to turn-of-the-century New York...
Michelle, who would follow her family tree...
Cherrymae33, who would watch the French and Sioux forge relationships in 18th century America...
Kay, who would go back to 1967 and visit the Montreal Expo.
Congratulations to you all, and thanks so much again to everyone who left a comment. Would the winners please send me an email at susanna (underscore) kearsley (at) yahoo (dot) ca, and tell me whether you'd prefer a trade paperback book or a hardcover one, and what name you'd like me to sign it to?
I'll actually be closing down this blog in a few days, now that the giveaway is over, but I've started up a new one now at http://www.womaninjeopardy.blogspot.com, that I can use for future giveaways and any random musings I might have between the (almost) monthly updates of my website.
Hope to see you over there :-)