It led to recognition of post-traumatic stress as a legitimate psychological ailment
By exposing the citizen armies of Europe to prolonged and extreme
danger, World War One generated psychological casualties on an
industrial scale. This, in turn, created a military crisis that drew
doctors from a diverse range of specialties into the field of mental
health; never before had so much attention been focused on a single
psychiatric disorder.
        
             
        
        
        
Answer:
They needed natural resources from other countries.
Explanation:
Factory owners in the advanced economies required natural resources from other countries. Coal, iron, gold, silver, tin, copper, rubber, and cotton were essential to keep the factories operating. They could be taken from colonies. These same countries required markets for their manufactured products.
 
        
             
        
        
        
Answer:
The colonist organied to carry out the Boston Tea Party
Explanation:
 
        
             
        
        
        
The effect of john brown leading attacks on harpers ferry is federal troops begin capturing southern territories.
<h3>Who was Harpers Ferry?</h3>
John Brown attacked harpers ferry hoping to capture the arsenal and start a slave rebellion in the south.
Federal troops begin capturing southern territories was the major effect of john brown leading attacks on harpers ferry.
Therefore, D is the correct option.
Learn more about Harpers Ferry here:
brainly.com/question/10301178
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By passing laws to create the Supreme Court. by establishing the three branches of government. by passing laws to regulate commerce. by establishing the offices of President and Vice President.