The pre-1890 expansion period in the US was marked by economic expansion (expansionism) fueled by, industrial growth, demand for fertile land, economic opportunities, and used economic policies after the closure of the revolutionary war while the post-1890 American expansion (19th C) was marked by imperialism, military expansion and formulation of policies to increase US powers, i.e. US signed a treat with China to gain diplomatic and trade relations resulting in the US taking over the Pacific ports.
In several ,ways.
the America did not remain isolated because it involved itself in several battles with its opponents, and expanded westwards, fought battles with Mexico, and Spain, and enacted several doctrines that implied interventionism. Isolation was simply a guiding principle,or ideology that the new nation never employed in specific interests situations.
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Explanation:
Industrial revolution is defined as the changes in manufacturing and transportation that began with fewer things being made by hand but instead made using machines in larger-scale factories.