What does Article one in the U. S. Constitution establish and for what purpose?

Article One of the United States Constitution establishes the legislative branch of the federal government, the United States Congress. ... Article One grants Congress various enumerated powers and the ability to pass laws "necessary and proper" to carry out those powers.

Explanation:

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to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.