Answer:
D. There was no more frontier land
Explanation:
This is the answer because the 1890 census said that the frontier region of the United States no longer existed which means there was no more frontier land.
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The US wasn't involved in any physical fighting prior to the attack on Pearl Harbor but we were sending supply convoys to Great Britain.
The war ended on November 11, 1918, and America's economic boom quickly faded. Factories began to ramp down production lines in the summer of 1918, leading to job losses and fewer opportunities for returning soldiers. This led to a short recession in 1918–19, followed by a stronger one in 1920–21
The cathedrals using Gothic architecture.
