The Endless Steppe by Esther Hautzig- The story of a Jewish family from eastern Europe who is deported to Siberia (as I recall, to Kazakhstan). Very interesting. According to this book, deportation to Siberia isn't exactly what I imagined.
Quest for a Maid by Mary Frances Hendry- Historical fiction based on a Norwegian princess who was shipwrecked on her way to England. I like this one.
The Mermaid Summer by Mollie Hunter- Pretty good. Two children who have to defeat a mermaid to help the return of their father.
...and Now Miguel by Joseph Krumgold- The story of a young boy from a sheepherding family who has to prove himself.
Good Night Mr. Tom by Michelle Magorian- This is a very good book. It has many sad and disturbing parts, but so many wonderful things to make up for it. I suggest prereading it, since it includes child abuse.
The Seventeenth Swap by Eloise McGraw- A boy has to figure out a set of swaps to get what he wants. Good book.
By Wagon and by Flatboat by Enid Meadowcroft- This wasn't an amazing story, but it was good because it talked about pioneers just after the Revolutionary War. Most pioneer stories are set later in history.
Where the Broken Heart Still Beats by Carolyn Meyer- Another excellent book. An American girl is kidnapped and raised by Indians. Her Indian husband is killed and she is taken back to live with her relatives. Highly recommended.
The Pushcart War by Jean Merrill- I love this book. The story of trucks trying to take over NYC, starting with the destruction of the pushcarts. I read this one over and over as a child.