What it's trying to say is, how can one person defend the free rights that Americans have today, Well you can obiously protest and stand up against the government, make public speeches to encourge others to not let their freedom get taken away, and lastly Our freedom is stated in the 10th amendement, so it cant be taken away.
Juliet knows that she is supposed to hate anyone from the house Montague. Their families are enemies because of the lords of each house and still, Juliet, a Capulet, fell in love with Romeo, who is a Montague.
