In the years between 1865 - 1900, what ideas and philosophies most influenced the transformation of the United States from isolationism to expansionism? Please keep answers from 2-4 sentences. Thank you :)

During the years between 1865 - 1900, ideas and philosophies such as industrial revolution, immigration, foreign policies, internationalism, etc emerged rapidly in U.S.

Explanation:

During the years between 1865 - 1900, ideas and philosophies such as industrial revolution, immigration, foreign policies, internationalism, etc emerged rapidly in U.S. Us started looking towards Westward expansion by introducing the Transcontinental railroad to connect with other continents.There was economic competition with France and Britain which further increased U.S need to expand market and economic influence with other countries. It led to US pacific expansion towards the Latin American continent.