Ye that oppose independence now ye know not what ye do; ye are opening a door to eternal tyranny by keeping vacant the seat of government. what is the rhetorical technique in this quote

Hyperbole

A hyperbole is an exaggeration that is not meant to be taken literally. It is usually used to make a persuasive point or to add emphasis. In this case, "opening a door to eternal tyranny" is an example of an exaggeration of this type. While it is likely that tyranny will not be eternal (the country itself will not be eternal), its purpose is to emphasize the risk of keeping the seat of governent vacant.

intonation based on rhythm.