Given the task definition and input, reply with output. In this task, you are given dialogue, and you have to find the most critical location in the given conversation.

Hello what can you tell me about China and its history
Sure my pleasure. Did you know constitutional rule was established in 1947, but because of the ongoing unrest, many provisions of ROC constitution were never implemented in mainland China.
Interesting can you tell me more about their history
Well in fact major combat in the Chinese Civil War ended in 1949, with the Communist Party in control of most of mainland China.
Are there any other interesting facts about their history
Since the surrender of Japan in 1945, Taiwan, including the Pescadores was returned to Chinese control.
That's great now what can you tell me about their geography
Well my facts are limited on this topic, but China covers an area of 9.6 million square kilometers.
Interesting I didn't realize it was that large what else can you tell me about the geography
Currently a major environmental issue in China is the continued expansion of its deserts, particularly the Gobi Desert.
Are there many deserts in China?
China's landscape is vast and diverse, ranging from the Gobi and Taklamakan Deserts in the arid north to subtropical forests in the wetter south.
China