According to imperialists, which of these would have been an economic justification for the expansion of the united states? a) the nation needed a stronger military since other nations were building a global presence. b) the nation should colonize as many available lands to prevent other countries from expanding. c) the nation's manufacturers needed raw materials and new markets were needed for the nation's goods. d) the nation had a responsibility to spread christianity and civilization to "inferior peoples" of the world