Sharp decrease in numbers of native Indians.
One  of the main reasons why Spanish conquistadors had to look for slaves from Africa, was the radical decrease in the populations of native Indians. The Indians had either died out of diseases or during the war of conquest. In  addition, inter marriages had also occurred, and usually the mestizos were exempted from months of forced hard labor in the farms and the mines. However the main cause of decline of populations of native Indians was diseases such as small pox which the Spanish colonists had brought with them.
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Answer:
A. The creation of the mobile X-ray machines allowed the soldiers to have a much higher chance of survival as the doctors were able to find shrapnel and other issues before performing surgery
Explanation:
Marie Curie invented a vehicle containing an X-ray machine and photographic darkroom equipment that was used in WW1. 
 
        
             
        
        
        
During the 1930s, the combination of the Great Depression and the memory of tragic losses in World War I contributed to pushing American public opinion and policy toward isolationism. Isolationists advocated non-involvement in European and Asian conflicts and non-entanglement in international politics.
 
        
             
        
        
        
Answer:
could you post a pic of the drop down menus?
 
        
             
        
        
        
Answer:
LEMME SMASH PLEASE
Explanation:
They influenced the law, democratic government practices, influences in language, literature, art, construction, and city-planning.
Oh PS: i think they created ice cream ¯\(°_o)/¯
Pls mark brainliest thx