What allowed china to develop its civilization with little outside interference

The Great Wall.

Explanation:

The Great Wall of China is a defensive structure built between the 3rd century BC and the beginning of the 17th century to protect the ruling Chinese dynasties from foreign invaders.  The wall, which has an extension of more than 21,000 kilometers, is for the most part about eight meters high and 6-8 meters wide. It is built of earth, stone and brick.

The wall was born in the 200s BC by uniting separate walls to protect China from attacks by northern nomadic tribes, and its newest parts were built in the 17th century. At some point, the entire Chinese male population participated in the construction of the wall. The wall became redundant in 1644, when China extended north of the wall as well. The wall eroded for centuries until, in the 20th century, it was raised as an important national symbol in China.

yes based on alexanders actions he deserved the title of "the great". his empire covered about 3,000 miles and he was able to establish the empire over a 13 year period of time. he was able to conquer many different places. he also defeated the persians. he conquered egypt and developed a city and named it after himself.

a.opium

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