The Indian Citizenship Act of 1924, (43 Stat. 253, enacted June 2, 1924) was an Act of the United States Congress that declared Indigenous persons born within the United States are US citizens. Although the Fourteenth Amendment to the U.S. Constitution provides that any person born in the United States is a citizen, there is an exception for persons not "subject to the jurisdiction" of the federal government. This language was generally taken to mean members of various tribes that were treated as separate sovereignties: they were citizens of their tribal nations.....
en.wikipedia.org
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So if Native American born in America were not citizens and a Congressional act was required to grant them citizenship why is the child of two illegal aliens a citizen.

Indian Citizenship Act - Wikipedia
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So if Native American born in America were not citizens and a Congressional act was required to grant them citizenship why is the child of two illegal aliens a citizen.