The Underground Railroad is not a railroad that is underground, instead, it is referring to a secret passage for slave escaping in safe houses. The conductor of the Underground Railroad could be the person who helps the slave escape, the lines could refer to the road or the passage which the slaves escaped from one safe house to another, the station could refer to the stops they make in the safe houses, and the freight may refer to the slaves that are escaping.
Answer:
Nationalism and imperialism encouraged each European nation to pursue its own interests and compete for power. ... The alliance system pulled one nation after another into the conflict.
Explanation:
We first domesticated farm animals, sheep and goats were among the first domesticated roughly 11,000 years ago.
Cats became pets around 7000 B.C. with the advent of agriculture.
No one can pinpoint exactly when humans first started keeping dogs as pets, but estimates range from roughly 13,000 to 30,000 years ago.
A team of archaeologists recently presented new evidence that horses were domesticated in 3500 B.C.—about a thousand years earlier than previous estimates
By making steam engines a reliable power source
