Volumes 1-15 shed light on virtually every aspect of the postwar and New Deal eras: party politics, social reform movements, the growth of organized labor, prohibition, changes in agriculture, and the government's new role in a broad range of socioeconomic programs. The documents also thoroughly cover foreign affairs during this era, including U.S. involvement in Central America and the Caribbean, U.S. policy toward the Soviet Union, the increasingly strained relations with Japan, and U.S. responses to the deteriorating political situation in Europe. The final 10 volumes (16-25) of Part II continue the broadly topical arrangement of selections established earlier. Volume 16 traces developments in shipping, trade, and tariff policies between 1926 and 1939. It covers the vast changes between the increasingly high-tariff and nationalistic years of the first decade to the reciprocal trade agreements and Good Neighbor Policy of the second.