While western movement and policies were reshaping the republic, European wars also presented a major challenge to the new country. The Napoleonic Wars (1802-1815) were a continuation of the conflict begun in the 1790s when Great Britain lead a coalition of European powers against Revolutionary France, though France was now led by the brilliant military strategist Napoleon Bonaparte. As had also been true in the 1790s, neither European superpower respected the neutrality of the United States. Instead, both tried to prevent U.S. ships from carrying goods to their enemy. Both Britain and France imposed blockades to limit American merchants, though the dominant British navy was clearly more successful.

Rebellions rarely succeed without foreign support. The North and South both sought British and French support. Jefferson Davis was determined to secure such an alliance with Britain or France for the Confederacy. Abraham Lincoln knew this could not be permitted. A great chess match was about to begin.

Unlike his predecessor, Richard Nixon longed to be known for his expertise in foreign policy. Although occupied with the Vietnam War, Nixon also initiated several new trends in American diplomatic relations. Nixon contended that the communist world consisted of two rival powers — the Soviet Union and China. Given the long history of animosity between those two nations, Nixon and his adviser Henry Kissinger, decided to exploit that rivalry to win advantages for the United States. That policy became known as triangular diplomacy.

The United States experienced extensive economic and geographical expansion during the 1840s, as the spirit of Manifest Destiny drove Americans west across the North American continent to exert their influence over new places and peoples. Influenced by this expansionary philosophy, political leaders sought to expand American trade relationships worldwide. One of the first targets of this campaign was to open diplomatic and trade relations with isolationist Japan, which had been closed to western traders for centuries. In 1852, President Millard Fillmore ordered Commodore Matthew C. Perry to lead an expedition to secure Japanese trade and access to Japan’s ports for American ships.

A survey of how America has become the world's largest consumer of energy. Explores American history from the perspective of energy and its relationship to politics, diplomacy, the economy, science and technology, labor, culture, and the environment. Topics include muscle and water power in early America, coal and the Industrial Revolution, electrification, energy consumption in the home, oil and US foreign policy, automobiles and suburbanization, nuclear power, OPEC and the 70's energy crisis, global warming, and possible paths for the future.

This collection uses primary sources to explore the rise of conservatism in the US in the 1980s. Digital Public Library of America Primary Source Sets are designed to help students develop their critical thinking skills and draw diverse material from libraries, archives, and museums across the United States. Each set includes an overview, ten to fifteen primary sources, links to related resources, and a teaching guide. These sets were created and reviewed by the teachers on the DPLA's Education Advisory Committee.