Why is the story called “Five Orange Pips”?
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In 'The Five Orange Pips,' pips, or orange seeds, were sent to various members of the Openshaw family from foreign locations just before their deaths. Through an encyclopedia, Sherlock Holmes connects the sending of orange pips to the KKK. This is a common practice to warn their enemies to comply with orders or die.

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers