Outside of Louisiana, the conflict became a harbinger for the obstacles to westward expansion and clashes ahead. American politicians became alarmed about the future of American governance, territorial expansion, and the growth of slavery, all issues raised by the Orleans protesters. John Quincy Adams, for example, worried that the government established for Louisianans violated the principles of the American Revolution. Federalist Fisher Ames believed that Jefferson's power over Louisiana would allow him to establish a western Republican empire ensuring the national demise of the Federalist Party. Slaveholders and supporters of slavery in the Congress attacked the restrictions on importation of slaves, using arguments in debates with opponents of slavery that were repeated until the outbreak of the Civil War.