Which region of the country has the greatest concentration of railroad lines?
Between 1900 and 2006, total world steel production X decreased✔ increased.
Which region seemed to provide the greatest obstacle to railroad expansion?
In 1900, X North AmericaAsia✔ Europe had more steel-producing countries than other continents.
In 2006, the world’s leading steel producers were located in North America✔ AsiaEurope.
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