You were looking for historical fiction, for teens but also possibly for adults. Since Angels Watching Over Me is also a Christian fiction title, I included a few YA books in that category as well.
A Day to Pick Your Own Cotton, by Michael Phillips.
This is the sequel to Angels Watching Over Me, so you will probably enjoy this one, too! Book 2 of Shenandoah Sisters. This book continues the story of two very appealing but contrasting characters and their secret mission to provide a sanctuary for others who have been left alone and adrift by a tragic war. This series concludes with: The Color of Your Skin Ain’t the Color of Your Heart, and Together is All We Need.
The River between Us, by Richard Peck.
During the early days of the Civil War, the Pruitt family takes in two mysterious young ladies who have fled New Orleans to come north to Illinois. (This is set during the same time period as Angels Watching Over Me.)
Sarah Bishop, by Scott O'Dell.
Left alone after the deaths of her father and brother who take opposite sides in the War for Independence, and fleeing from the British who seek to arrest her, Sarah Bishop struggles to shape a new life for herself in the wilderness.
Boston Jane, by Jennifer L. Holm.
Schooled in the lessons of etiquette for young ladies of 1854, Miss Jane Peck of Philadelphia finds little use for manners during her long sea voyage to the Pacific Northwest and while living among the American traders and Chinook Indians of Washington Territory.
Peregrine by Joan Elizabeth Goodman.
In 1144, fifteen-year-old Lady Edith, having lost her husband and child
and anxious to avoid marrying a man she detests, sets out from her home
in Surrey to go on a pilgrimage to Jerusalem.
Beyond the Western Sea, Book One: The Escape From Home, by Avi.
From the desperately poor Irish villages of the 19th century potato famine to the streets of London and Liverpool, from the misery of crossing the Atlantic in steerage to the mills of Lowell, Massachusetts, the lives of several young people and various villains intersect fatefully in this page-turning, cinematic drama.
The Masquerade (Becoming Beka series, #1) by Sarah Ann Sumpolec.
When she moves to a new school Beka only pretends to be a Christian, but
when she learns that truth brings freedom, she gains peace, faith, and
Becoming Me (Diary of a Teenage Girl, book 1) by Melody Carlson.
Sixteen-year-old Caitlin O'Conner keeps a six-month diary in which she
records the day-to-day events of her life as well as her struggles to
understand herself and God's plan for her future.