Final answer:
Chief Joseph's statement 'In thirty suns, we will be gone. There must be no blood' signifies his resolve to stop fighting to avoid further bloodshed and seek peace for his tribe, as part of his surrender speech to the U.S. Army.
Step-by-step explanation:
This message is part of his larger capitulation speech given in 1877, which is a powerful and poignant declaration of surrender to the U.S. army.
This statement reflects his commitment to prevent further suffering and loss of life among his people, despite the dire predicament the Nez Perce tribe faced at the time.
The phrase 'In thirty suns' uses a figurative expression to denote thirty days, indicating the time frame in which he foresaw the end of his people's resistance, while 'no blood' means that he did not wish for any more bloodshed or violence.