Which of these technologies was able to spread because of the growth of american railroad networks ?
a. the electric light bulb
b. the telegraph
c. the mechanical harvester
d. the internal combustion engine

d. the internal combustion engine

Explanation:

There's a type of railway locomotive in which diesel is the prime mover. This type of railway locomotive is called "A diesel locomotive."

Many different types of these were made, but the main different is usually on how the mechanical power is conveyed to the driving wheels.

Early Internal Combustion locomotives at first used kerosene and gasoline as fuel, but eventually, they were improved. In 1898, steel engines reduced sized and improved power of the locomotives.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

explanation: