Original sentence: In the United States, Henry Clay and Thomas Jefferson set forth the principles of Pan-Americanism in the early 19th century, and soon afterward the United States declared through the Monroe Doctrine a new policy with regard to interference by European nations in the affairs of America
Edited sentence: In the United States, Henry Clay and Thomas Jefferson set forth the principles of Pan-Americanism in the early 19th century, and soon afterward the United States declared through the Monroe Doctrine a new policy with regard to interference by European nations in the affairs of the Americas