Answer: Petroleum, Electricity and Steel
Explanation: The second industrial revolution is a period between the late 19th to the early 20th century which is characterized by massive growth and expansion of industrialization. The second industrial revolution is also known as the technological revolution most notable for steel production, expansion in electrification which was previously limited to very few cities and development of Petroleum and gas supply.
Plato, Socrates, Thales, Aristotle, Gorgias, Pythagoras, Thucydides
These scientists all study first source artifacts from prehistoric peoples, including fossils, archaeological digs, etc. By observing and analyzing these objects, they are able to infer how these prehistoric peoples lived before there was any written record.
Answer:
Correct answer is It shifted US Policy towards imperialism.
Explanation:
Second option is the only correct as it marked the expansion of United States. United States decided to spread their influence outside American continent, which put them in the line of great imperial forces.
All other answers are therefore wrong, as they are not expressing the attitudes of the American government at the time.