"Every citizen or subject of another country, while domiciled here, is within the allegiance and the protection, and consequently subject to the jurisdiction, of the United States"

This quote by Horace Gray is referring to the principle of extraterritoriality, which is the legal status of an individual who is not a citizen of the nation in which they are presently living. In this quote, Gray is asserting that any non-citizen who is residing in the United States goes through the jurisdiction of the United States. This means that they are under the defense of the United States and must abide by its laws. This quote is necessary due to the fact that it highlights the value of respecting the laws of the nation in which one is living, no matter their citizenship status. It also acts as a reminder that the United States is a nation of laws and that all people, despite their citizenship status, need to follow them.