hoof
mongolia
steppes
himalayas
beats
eurasian
rockies
mounted
transforms
horses
spanned
momentous
plains
riding
archaeological
exchange
guides
civilizations
globalization
placed
altered
dna
humanitys
taylor
horse
asks
discoveries
bond
invention
indigenous
biological
explosive
consider
perspectives
transportation
drawn
spread
inequality
tracing
william
revolutionary
shift
humans
humanity
western
origins
means
ancient
trade
course
create
helped
relationship
live
shaped
drawing
events
major
understanding
past
today
research
explores
great
journey
offers
social
account
future
readers
human
time
new
story
history
world