C. It let to the mass migration of the Indian elite.
OK! so i just did this question not too long ago after studying it my answer was "C"
On May 10, 1869, at Promontory Point, Utah, workers drove a spike that linked two rail lines, one snaking from the East, the other from California, completing America's first transcontinental railroad. This event helped launch an era of economic development that would transform a Jeffersonian society of yeoman farmers into an industrial powerhouse.

c. <u>The lend-Lease Act of 1941</u> demonstrates the U.S. shift from neutrality to involvement in World War II.
<h2>
<u>Hope it helps You. </u>✌✌</h2>