What the indirect object in this sentence? " American Indians showed settlers how to plant corn."

Settlers are the indirect object.

Explanation:

an indirect object is a noun or pronoun that occurs in addition to a direct object. The indirect object is always comes after a verb.

it indicates the person or thing that receives what is being given or done

So in the sentence above the people receiving are the settlers.

What they are receiving is learning how to plant corn.

American Indians (direct object)  showed (verb) settlers (indirect objects)

how to plant corn (the thing being given)

hope this helps :-)

"Settlers" is the indirect object.

Explanation:

You can think of the sentence recast in this way -- if it helps:

              S                 V                    DO                       IO

American Indians showed how to plant corn to the settlers.

Direct objects are the primary 'recipients' of the action, while indirect objects are the secondary 'recipients' of the action.

                    IO  DO                            DO     IO

Ex.    I gave you this.     VS.    I gave this to you.

what is the question you are trying to ask here