What is considered to be America's first big business that helped with the development of other industries?

A. the railroad
B. the airplane
C. wind power
D. copper mining

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A. The railroad is considered to be America's first big business that helped with the development of other industries. One of the main things that people started working on during the Industrial  Revolution was a transcontinental railroad. There was a ton of business around this, and the completion of this railroad was historic, which is why the Golden Spike in Promontory, Utah has such important historical significance.

This helped with other industries because many industries used trains to be efficient. It also helped people travel much easier and quickly, which helped other industries to develop quickly.

I hope that this helps! Have a wonderful day! :D

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

hope this : d

d

step-by-step explanation:

an inequality is an expression which means more than one number is a solution. we graph the solutions on a number line to show all possible values. we graph using circles and arrows.

this is a filled in circle on -2 so this is . this means only answers c and d are options.

answer d points to the right.