The author of this 1881 cartoon was most likely reacting to the Indian Appropriation Acts. Option D. This is further explained below.
Generally, Indian Appropriation Acts are simply defined as laws where the nineteenth and early twentieth century saw a large number of pieces of legislation enacted under the same name.
In conclusion, The Indian Appropriation Acts are likely the inspiration for this 1881 cartoon.
Read more about the Indian Appropriation Acts.
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