Cities were able to expand their geographic areas in the late 19th century because of the development of
a.
skyscrapers.
b.
settlement houses.
c.
assembly lines.
d.
mass transit.

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.

yes i am pretty sure hope this