The Etruscans didn't have any sophisticated system of writing, which meant that there aren't many documents that we have that state how they ruled(There are some but we don't know if it came from the Etruscan empire for sure). Just so you know, the Etruscans and the Romans aren't necessarily separate. They actually ruled over Rome for around a century and then left for unknown reasons. During this time period, Roman philosophy, art, architectures were also at their peak Hope I helped :)
What is the reason does Jackson give for not accepting a state possess the authority to resist federal laws according to that state's own assessment. Because the proportion of the nation is devastate and becomes as misdeed against the entire union.