I'm pretty sure it's Philadelphia and Denver
There's no country that begins with x. xi'an in china. xalapia in mexico.
In this question, there are no options given to choose from. This makes it harder to answer the question accurately. Still i hope my answer satisfies you. The rule of law serves as a long term protection against tyranny and is a foundation of liberty in the United States of America. The rule of law helps to maintain peace within the country.