中美共同防禦條約
Between 1952 and 1954, the Eisenhower administration increased its diplomatic, economic, and military aid to Taiwan, with economic aid valued at USD $527 million and military aid at USD $940 million. On September 3rd, 1954, the CPC began a heavy artillery bombing of the Chinese islands of Quemoy and Matsu, a smaller group of islands just off the mainland that ROC officials considered optimal for strategic positioning and reinvasion of the mainland. The PRC additionally held thirteen American prisoners and was threatening their execution, prompting further action by the Eisenhower administration. On December 2nd, 1954, the Sino-American Mutual Defense Treaty was signed between the U.S. and the ROC, in addition to other mutual security agreements in the Pacific.