One of the Roman Empire's important achievements was: A. ending the practice of slavery.
B. becoming the first polytheistic empire.
C. creating influential art and writing.
D. offering all people religious freedom.

Correct answer is C. creating influential art and writing.

Explanation:

Option A is not correct answer as slavery existed in Rome until the last days of existence.

Option B is not correct as most of the Empires before the Roman were polytheistic, including Egyptian, Assyrian...

Option C is correct as Roman artists and writers made a large impact on European art, especially in the period of Renaissance.

Option D is not correct as in certain period Romans were not allowing religious freedom. The best example for that is Christianity until the 4th century.

b. native americans them

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.