weather patterns underwent server changes, as a result, China had droughts and famines. As China's economy suffered, South east asia's economy also suffered. sg also fell prey to more powerful kingdoms such as majapahit and ayutthaya( in thailand). Sg was also overshadowed by melaka as it rose greatly. Melaka has also a good location, safe harbor, attracked muslim traders as Parameswra conversion to Islam and married a muslim princess from Sumatra. it also had protection from china.