The yellow river is located at
the structure built to keep out the northern barbarians was
called the
and is located at
the silk road is located at

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.

answer; i believe that the correct answer is (chronological order);

i think u are supposed to write a long-essay answers to the long-essay questions

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).