Tại sao nói: Ở tiểu học, bên cạnh học tri thức khoa học, học cách học cũng trở thành mục đích của mỗi giờ lên lớp?

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.  

answer; the president uses mass media to gain support for policies;