Colombia
is
the
only
____________________
gateway
to
____________________
America
and
is
assumed
to
have
been
the
route
pioneered
by
the
continent's
first
human
____________________
,
who
migrated
from
____________________
and
____________________
____________________
.
Some
tribes
,
such
as
the
____________________
,
headed
further
south
and
built
major
____________________
,
while
smaller
groups
settled
in
what
is
now
____________________
and
eventually
reached
a
high
level
of
development
.
____________________
people
are
little
known
internationally
because
they
____________________
few
enduring
monument
s
