Why Didn't Chinese Communists Occupy Taiwan After Conquering Mainland China?

[mech-eng]

Why didn't Chinese comminists attacked and occupied the Formoza island after they had conquered the China mainland? Formal name of Taiwan is Republic of China, but it is strange that everbody understand big China from Republic of China. If formal name Republic of China is Taiwan informal? I know the island the country established on is called as Formoza.

Best Regards.

 

[.Scott]

See http://en.wikipedia.org/wiki/Battle_of_Guningtou.