Which describes a major challenge facing the builders of the transcontinental railroad?
a.
bridging the rio grande river
b.
spanning the grand canyon
c.
tunneling under lake erie
d.
crossing the sierra nevada mountains

During the war of 1812, the united states tried to capture land that is part of which of the following countries? a. france b. spain c. canada d. mexico

What was the first civilization name of the indians?

Which best explains how wealthy residents of italian cities contributed to the renaissance? a) wealthy residents bought works of art, which supported artists. b) wealthy residents participated in religion, which supported the church c) wealthy residents participated in music, which supported the arts. d) wealthy residents bought classical books, which supported scholars.