Perestroika describes the historical revolution of political and economic reforms which were aimed at accelerating economic growth, democratization, and openness. As the failings of the socialist economic model became more apparent, Eastern European nations were motivated to enact laws allowing foreign investment. A comparative analysis of these foreign investment laws in Poland, the Soviet Union, Hungary, and Yugoslavia is made. Even with the reforms in Eastern Europe, U.S. law may affect the actions of American investors in Eastern Europe. Specifically, U.S. export control laws effect the trade between the U.S. and countries still deemed to be communist, and U.S. antitrust laws apply if the foreign investment occupies the whole domestic market in the U.S.