We place at the top of the Tree of the Long Leaves an Eagle who is able to see afar. If he sees in the distance any evil approaching or any danger threatening he will at once warn the people of the Confederacy.
In this quotation, Dekanawidah is suggesting that
a bird will watch out for potential threats and warn the Nation.
someone will always watch from the top of the Tree of Long Leaves.
the Great Creator, who dwells in the heavens, will keep the Iroquois safe.
O the Iroquois nation will protect itself by carefully watching out for danger.

the Iroquois nation will protect itself by carefully watching out for danger.

Explanation:

Dekanawidah was revered Native American leader who was called the Great Peacemaker as he was the one who united several Native American tribes to establish the Iroquois Confederacy.

During the formation of the Confederacy, he alluded to the Iroquois placing an Eagle on the top of a the Tree of the Long Leaves to watch out for danger. The Iroquois were the Eagle in this story which meant that they would be very careful to watch for potential danger so that they would deal with it before it destroyed them.

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