- To what extent did European events influence the course of American development between 1795 and 1810? Formulate a thesis statement including three of the following: XYZ Affair, Alien and Sedition Acts, Louisiana Purchase, & Embargo of 1807 - Analyze the social changes that gave rise to mass democracy in the United States between 1820 and 1840. Include the roles of three of the following in a thesis statement: John Marshall, Henry Clay, Andrew Jackson, & William Henry Harrison