Meanwhile, the Supreme Court established the principle of judicial review, which enables the courts to review the constitutionality of federal laws and invalidate acts of Congress when they conflict with the Constitution.

The Jeffersonian era was marked by severe foreign policy challenges, including harassment of American shipping by North African pirates and by the British and French. In an attempt to stave off war with Britain and France, the United States attempted various forms of economic coercion. But in 1812--to protect American shipping and seamen, clear westerns lands of Indians, and preserve national honor—the county once again waged war with Britain, fighting the world's strongest power to a stalemate.