Answer:
B. geographic features protected the North China Plain.
Explanation:
The North China Plain is protected on four fronts by imposing geographical feature, which allowed early Chinese civilization to flourish without much external influence or threat.
To the north, the Gobi Desert, to the West, the Chinese Mountains, and the Tibet, to the South, more mountains, and to the West, the China Sea and the Pacific Ocean.
The correct answer to this open question is the following.
At the turn of the 20th century, the nations of Europe had been at peace with one another for nearly how many years?
Answer: The nations of Europe had been at peace with one another for nearly 100 years.
We are talking about the moment European nations signed the agreement during the Congress of Vienna in 1815, the so-called "Concert of Europe," until the beginning of World War I, in 1814, after the assassination of Archduke Franz Ferdinand, of the Austria-Hungary Empire.
One of the goals of the Congress of Vienna (1814-1815) was to restore Europe to the way it was before the French Revolution and Napoleonic Wars.
The answer is richard nixon i believe.
The correct answer should probably be The Mayan civilization was not built around a major river.
Most Mayan cities were found by archeologists deep inside of jungles, hidden from the world, away from rivers, whereas Mesopotamia was built on Tigris and Euphrates.