Imperialism would probably be the most significant factor, but nationalism and militarism were also important.
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I didn't understand you question, hence I am not able to avail you
The thirteen American colonies declared their independence from Britain in seventeen seventy-six. But they had to win their independence in a long war that followed. During that war, the colonies were united by an agreement called the Articles of Confederation.
Rivers allowed people to trade and transport easily!
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Economic, social and environmental trends come together, for example, looking at resource competition and climate change (the latter intensifying the lack of resources, leading to political conflict). State fragility continues to be a key source for internal conflicts, instability and human suffering
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