1. Thomas Jefferson’s purchase of the Louisiana Territory and the Lewis and Clark Expedition opened the west which led to Sectional Polarization.

2. Growth in transportation technologies, such as steam-powered locomotives, steamships, railroad tracks, and canals led to Sectional Polarization.

3. Urban growth in the north, compared to the south and west, as well as differences in the geography (climate and terrain), led to Sectional Polarization.

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Explanation:

The Louisiana Purchase (1803) was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million.

This little event, of France possessing herself of Louisiana, ... is the embryo of a tornado which will burst on the countries on both shores of the Atlantic and involve in it’s effects their highest destinies.

President Thomas Jefferson wrote this prediction in an April 1802 letter to Pierre Samuel du Pont amid reports that Spain would retrocede to France the vast territory of Louisiana. As the United States had expanded westward, navigation of the Mississippi River and access to the port of New Orleans had become critical to American commerce, so this transfer of authority was cause for concern. Within a week of his letter to du Pont, Jefferson wrote U.S. Minister to France Robert Livingston: "every eye in the US. is now fixed on this affair of Louisiana. perhaps nothing since the revolutionary war has produced more uneasy sensations through the body of the nation."

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