the answer is NOT determining the goal and criteria. I just took the test and got it wrong.
My best guess would be that it is D. conducting background research
What are all the choices?
Quite simple they were outnumbered by the Mexicans 1800 to 185 and they were outgunned.
They failed because nobody cared about the railroad. The railroad had to be a government project with leases to companies but the government was too much involved in the slavery issue that it didn't have time to deal with railroads. That's why railroads boomed after the civil war ended.
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