Final answer:
The modern art movement in America started with Impressionism, an art movement characterized by loose brushwork and vivid colors.
Step-by-step explanation:
The modern art movement in America started with Impressionism. Impressionism was an art movement that emerged in the late 19th and early 20th centuries, characterized by loose brushwork and vivid colors. It rejected the established art styles of Romanticism and Realism and focused on capturing brief glimpses of a moment in time. Impressionism paved the way for other modern art movements such as Post-Impressionism, Art Nouveau, Fauvism, Expressionism, and many others.