Given the large size and rapid growth of foreign direct investment in the United States, this subject is a central concern of US. firms and U.S. government policymakers, This study explores the factors that contribute to the explanation of FDI in the United States by country of origin of investment, Evidence from the past twelve years shows that the main significant positive influences are home country's exports to the United States and home country market size, Significant negative influences include the home country's imports from the United States, the cultural and geographic distances of the home country from the United States, and the exchange rate (fx/$).