evidence: Under the Commonwealth of the Philippines, the 1935 Constitution was adopted, reiterating the national territory of the Philippines, which included Scarborough Shoal and the Kalayaan or Spratly Islands.[24] After regaining independence in 1946, the Philippines again asserted its claims to the Spratly islands. The Americans at the time discouraged the Philippines to avoid conflict with the Chinese government of Chiang Kai-shek, who was an ally of the United States. In 1946, Vice President Elpidio Quirino reiterated the "New Southern Islands", the forerunner name for Kalayaan, as part of the Philippines.[25] [...] The Philippines has invoked its mutual defense treaty with the US to obtain US assistance in repelling Chinese forces from islands claimed by the Philippines. Signed in 1951, the treaty stipulates the two countries to defend each other in case of an attack from an external party. However, US does not include the Spratly Islands in its understanding of Philippine territory. Instead, the US limited itself in continuously supporting the Philippine defense programs with military and intelligence aid and training, and a variety of diplomatic measures aimed at sending a "strong message" to Beijing.[76] Such "strong messages" and the ASEAN intervention are believed to have calmed China's previously aggressive drive in the Spratly region.