Where do citation chains end?

They do not continue forever.

Researchers stop when they reach one of several points.

For example

Book (2020)

Article (2008)

Book (1985)

Parliamentary debates (1865)

Official legislative record

At that point,

you have reached the original historical evidence.

Or

Book A cites Book B.

Book B cites Book C.

Book C introduces the idea without citing anyone else.

The chain naturally ends there.

The purpose is not to chase references forever but to identify the foundations of a claim.

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