A dose of 1850's racial politics to start my day

Five minutes ago, at 5:34 AM, my nine year-old daughter, Clara, walked down the stairs, sat beside me, and the first words out of her mouth were these:

"Hey Daddy, I was reading about Harriet Tubman yesterday, and I was wondering:  Why did the northern states agree to pass The Fugitive Slave Law even though the north wanted to abolish slavery?"

Just how I wanted to start my day. 

I'm starting to think that she reads too much.