The answer is B.) Scientific theories.
Answer:
B I think
Explanation:
If the land was cheap and available, then people would move there
QUICK ANSWER
Three factors that spurred American imperialism were the need to expand even after the frontier had vanished, with industrialization warranting further claim to more resources, the growing importance of foreign trade to the American economy and the desire to compete with European empires for power. Because of this mixture of cultural, economic and political factors, the U.S. was influenced to practice imperialism, particularly during the late 19th and early 20th centuries.
One way in which circumstances were different from when Lincoln gave the first address was that "<span>C. For the first address, war was not imminent," since many still maintained hope that the Union would be preserved. </span>
