U.S.-China economic ties have expanded substantially over the past three decades. Total U.S.-China trade rose from $2 billion in 1979 to an estimated $459 billion in 2010. China is currently the second-largest U.S. trading partner, its third-largest export market, and its biggest source of imports. Because U.S. imports from China have risen much more rapidly than U.S. exports to China, the U.S. merchandise trade deficit has surged, rising from $10 billion in 1990 to an estimated $273 billion in 2010.

China is the world's most populous country with over 1.3 billion people. It has experienced tremendous economic growth over the last three decades with an annual average increase in gross domestic product of 9.8% during that period. This has led to an increasing demand for energy, spurring China to add an average of 53 gigawatts (GW) of electric capacity each year over the last ten years to its power generation capabilities. China essentially functions as a "command and control" economy.

Congress has long been concerned about whether U.S. policy advances the national interest in reducing the role of the People's Republic of China (PRC) in the proliferation of weapons of mass destruction (WMD) and missiles that could deliver them. Recipients of China's technology reportedly include Pakistan and countries that the State Department says support terrorism, such as Iran and North Korea. This CRS Report, updated as warranted, discusses the security problem of China's role in weapons proliferation and issues related to the U.S. policy response since the mid-1990s.

The automobile industry, a key sector in China's industrialization and modernization efforts, has been developing rapidly since the 1990s. In recent years, China has become the world's fastest growing automotive producer. Annual vehicle output has increased from less than 2 million vehicles in the late 1990s to 9.5 million in 2008. In terms of production volume in 2008, China has surpassed Korea, France, Germany, and the United States, trailing only Japan. A disproportionate share of China's output was heavy vehicles in the 1990s.

Given its relatively low savings rate, the U.S. economy depends heavily on foreign capital inflows from countries with high savings rates (such as China) to help promote growth and to fund the federal budget deficit. China has intervened heavily in currency markets to limit the appreciation of its currency, especially against the dollar. As a result, China has become the worlds largest and fastest growing holder of foreign exchange reserves (FER). China has invested a large share of its FER in U.S.