The statement that best describes a belief of the national republicans in the 1820s is "individual state projects can create conflict and divide the nation.
The National Republicans, also known as the Anti-Jacksonians, were a political party in the United States that existed from 1824 to 1834. They were formed in opposition to President Andrew Jackson and his policies. The National Republicans were generally more pro-business and favored a stronger national government.
One of the National Republicans' key beliefs was that individual state projects could create conflict and divide the nation. They argued that the federal government should play a more active role in infrastructure development, such as building roads and canals.