Yes
The colonists in the Declaration of Independence clearly stated their grievances and made a case against England, declaring to the world the reasons that caused them to declare their independence and fight to become the United States of America. These include taxation without representation
The machine gun was decisive in securing victories for the Allies in WW1, if that's the time period this is focused on.
They were African Americans who spoke and wrote in favor of abolition. hope this helps :)
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As long as the German's were fighting a war on two fronts, they couldnt send the resources they needed to the western front, allowing the allies to make some major pushes into occupied territory.