Which items do historians study to learn about the past

The mongols were descendants of a. pastoral nomadic tribes b. tibetan tribes c. shang nobility

His is the name of the group in the house of representatives that, in 1947, began hearings to expose communist infiltration in american life. unfortunately, a good deal of the evidence they used was based on hearsay and conjecture, meaning innocent people were harmed by their findings.

How many battles in wwii were fought on u. s. soil?