Which diagram shows how changes in steel production in the late 19th and
early 20th centuries affected transportation in the United States?
OA.
OB.
O C.
O D.
Steel refinement
increased as new
iron deposits
were discovered.
Steel was made
lighter than before.
Steel could be
produced more
quickly.
Steel production
was made faster and
more efficient.
caused
caused
caused
caused
The military began
to invest in
mechanized warfare.
The new aviation
industry used steel
to make airplanes
more efficiently.
Rails for train transport
were laid down across
the country.
Telephone communi-
cation became
increasingly popular.