China's emergence as a global economic superpower, and as a major regional military power in Asia and the Pacific, has had a major impact on its relations with the United States and its neighbors. China was the driving factor in the new strategy the United States announced in 2012 that called for a "rebalance" of U.S. forces to the Asia-Pacific region. At the same time, China's actions on its borders, in the East China Sea, and in the South China Sea have shown that it is steadily expanding its geopolitical role in the Pacific and having a steadily increasing impact on the strategy and military developments in other Asian powers.