The Aztecs built a powerful and wealthy empire by O A. Militarily conquering other tribes and making alliances
O B. Using gold and silver to control Mesoamerican trade
o c. Destroying their Toltec and Mayan rivals
O D. Allying with Spanish conquistadors

O B. Using gold and silver to control Mesoamerican trade

Explanation:

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.  

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )