The writers of this article include the phrase "or any of them" to ensure that all the states would defend an individual state.
The phrase "or any of them" has been used to refer to individual states. This excerpt has been taken from Articles of Confederation which were adopted by the Continental Congress on November 15, 1777. This document served as the United States' first constitution. It was in force from March 1, 1781, until 1789 when the present-day Constitution went into effect. The Articles of Confederation served as the written document that established the functions of the national government of the United States after it declared independence from Great Britain.
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