What is one main characteristic of secondary sources is tended for ace Sonics and students

Can someone me write a paragraph on this topic i feel confused

Which of the following is not true of the xiongnu empire? burial mounds included glass beads and mirrors made from the sands throughout the region. there was more cooperation through trade between the tribes. other tribal units that were eventually assimilated were indo aryan, xianbei, hunyu, scythina and han chinese. as each nomadic tribe and civilization was conquered or absorbed into the larger empire, the xiongnu were able to hold more territory.

Describe the economic recovery in western europe after world war 2