<span>They built up their supply of arms and made agreements to support each other in the event of war.
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They were like coworkers, there not allies, but they know each other.
The answer would be the availability of new farming land in the west, while back east, most of their land had already been taken.
Former US President Harry Truman is known for the foreign policies he implemented in response to the growing tension between the United States and the Soviet Union. Among his foreign policies is the Truman Doctrine wherein it is usually offensive in nature because it aims to fund a territory when it is under retaliation from a communist rule.
