baumgartner
annexing
alta
slaverys
nuevo
sectional
runaways
1837
méxico
antislavery
1840s
abolished
southerners
antebellum
invading
seizure
runaway
salvation
alice
heading
upset
hoped
delicate
slaves
crossing
escaped
slave
promised
revelatory
railroad
slavery
causes
secure
border
underground
mexico
balance
southern
stop
radical
fueled
historian
increasingly
california
policies
thousands
freedom
road
texas
instead
essential
central
free
south
north
civil
crisis
perspective
tells
united
states
america
future
political
people
war
american
new
story