The inference is that the factor that will be cured as contributing to the phenomenon described is D. The construction of the Transcontinental Railroad.
<h3>What is an inference?</h3>
An inference is the conclusion that can be deduced based on the information given in a story.
In this case, the inference is that the factor that will be cured as contributing to the phenomenon described is the construction of the Transcontinental Railroad.
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The were people that challenged the racial laws in the 1960's
That slaves were treated unfair than the rest of the citizens