What role did the nicola sacco and bartolomeo vanzetti case play in america’s fears?

From which of the following literary works is this quotation most likely taken?

Which statements explain reasons why unconformities occur? check all that apply. rocks along a fault break and move. igneous rock forms at earth’s surface. rocks erode and sediment is deposited. no sediment is deposited over a long time. igneous rock forms between sedimentary layers.

Who were the people that migrated south into india and indus valley