“The United States government has always been proud of the welcome it has extended to good men of every nation, seeking freedom and homes and bread.”

Interview for The Times (31 May 1984) http://www.margaretthatcher.org/document/105505
Second term as Prime Minister

Source: The Next 100 Years: A Forecast for the 21st Century (2009), pp. 224–225
Context: In the United States, minority populations were never an indigestible mass—with the major exceptions of the one ethnic group that did not come here voluntarily (African Americans) and those who were here when Europeans arrived (American Indians). The rest all came, clustered and dispersed, and added new cultural layers to the general society. This has always been the strength of the United States. In much of Europe, for example, Muslims have retained religious and national identities distinct from the general population, and the general population has given them little encouragement to blend. The strength of their own culture has therefore been overwhelming.

Source: Politics Among Nations (1948), p. 42 (1985 edition).

Declaration of Conscience (1950)
Context: As a United States Senator, I am not proud of the way in which the Senate has been made a publicity platform for irresponsible sensationalism. I am not proud of the reckless abandon in which unproved charges have been hurled from this side of the aisle. I am not proud of the obviously staged, undignified countercharges that have been attempted in retaliation from the other side of the aisle. I don't like the way the Senate has been made a rendezvous for vilification, for selfish political gain at the sacrifice of individual reputations and national unity.

(1981)

Address to the United Nations (1964)
Context: Those who kill their own children and discriminate daily against them because of the color of their skin; those who let the murderers of blacks remain free, protecting them, and furthermore punishing the black population because they demand their legitimate rights as free men — how can those who do this consider themselves guardians of freedom? The government of the United States is not the champion of freedom, but rather the perpetrator of exploitation and oppression against the peoples of the world and against a large part of its own population.

The British Crisis (1948)

Presidency (1977–1981), Farewell Address (1981)
Context: Within our system of government every American has a right and duty to help shape the future course of the United States.
Thoughtful criticism and close scrutiny of all government officials by the press and the public are an important part of our democratic society. Now as in our past, only the understanding and involvement of the people through full and open debate can help to avoid serious mistakes and assure the continued dignity and safety of the nation.