Final answer:
In August of 1856, federal officials made Isaac Stevens appoint an attorney for the prosecution of Leschi in response to his killing of a white settler. This eventually led to Leschi's trial and execution, impacting Native American relations.
Step-by-step explanation:
In August of 1856, federal officials made Isaac Stevens take action in response to Leschi's killing. Isaac Stevens, the governor of the Washington Territory at the time, had previously signed a treaty with Leschi and other Native American tribes.
However, after Leschi was accused of leading an attack that resulted in the death of a white settler, federal officials compelled Isaac Stevens to appoint an attorney for the prosecution of Leschi. This legal action eventually led to the trial and execution of Leschi, which had significant consequences for Native American relations with the government.