What caused industrial psychologists to begin working with the military was <span>U.S. entry into WWI.
After years of upholding its isolationist policy of not getting involved with any wars it has nothing to do with, the US actually decided to go back on that decision and join the WWI. This is why many psychologists started working with the army in order to help the soldiers.
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The California Gold Rush began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California from the rest of the United States and abroad.
Answer:
A
Explanation:
Railroads were used all across the U.S for long journeys. Ships were used for trans-Atlantic voyages. These voyages were safe due to pirates and bandits dying out during the 1830s.
I think the answer is C, I hope this helps
