In January 1791, preesident George Washington<span>'s Secretary of the Treasury Alexander Hamilton proposed a seemingly innocuous excise tax "upon spirits distilled within the United States, and for appropriating the same." and thats the answer</span>
Based on the sentence of the excerpt,
The main purpose of the final sentence from Thomas Paine's common sense would be :
To indicate that the American colonies can establish a better government thana monarchy
Hope this helps
