What the greatest factors that contributed to the fall of the soviet union?

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

By the late 1930s, how were u.s. officials beginning to view japanese policies of expansion? a. they attempted to join forces with japan so as to increase u.s. territory. b. they warned them to stop expansionist actions or face potential u.s. intervention. c. they sent representatives to japan to work out territorial rights in a diplomatic fashion. d. they became fearful of their military power

Which type of constitutional power allows congress to regulate immigration and naturalization?