“It is so easy to be an enemy of the United States, but so difficult to be a friend.”
As quoted in a response to Anna Chennault in 1975
Langguth, A.J. Our Vietnam, New York: Simon & Schuster, 2000 page 656.
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Nguyễn Văn Thiệu 4
president of South Vietnam from 1965–75 1923–2001Related quotes
“The trouble with unknown enemies is that they are so difficult to identify.”
Source: The Hippopotamus Pool

“The enemy of my enemy is my friend, so that makes Google my best friend.”
Quoted in Miguel Helft, " Google and Salesforce Join to Fight Microsoft http://www.nytimes.com/2008/04/14/technology/14google.html?_r=1&oref=slogin", New York Times (April 14, 2008).

After being refused a passport for his supposed disloyalty. The New York Herald Tribune (31 March 1954)

As quoted in Diogenes Laërtius, Lives and Opinions of Eminent Philosophers, "Pythagoras", Sect. 23, as translated in Dictionary of Quotations http://archive.org/details/dictionaryquota02harbgoog (1906) by Thomas Benfield Harbottle, p. 320

“Poor Mexico, so far from God and so close to the United States!”
As quoted in The Quote Verifier: Who Said What, Where, and When https://en.wikiquote.org/wiki/Special:BookSources/0312340044 (2006), by Ralph Keyes, New York City: St. Martin's Griffin, p. 387

“If this is how you treat your friends, no wonder you have so many enemies.”

Quote, First State of the Union Address (1865)
Context: Certainly the Government of the United States is a limited government, and so is every State government a limited government. With us this idea of limitation spreads through every form of administration — general, State, and municipal — and rests on the great distinguishing principle of the recognition of the rights of man. The ancient republics absorbed the individual in the state — prescribed his religion and controlled his activity. The American system rests on the assertion of the equal right of every man to life, liberty, and the pursuit of happiness, to freedom of conscience, to the culture and exercise of all his faculties. As a consequence the State government is limited — as to the General Government in the interest of union, as to the individual citizen in the interest of freedom.