Via Charles Pierce:

[The United States] has, in the lapse of nearly half a century, without a single exception, respected the independence of other nations while asserting and maintaining her own. She has abstained from interference in the concerns of others, even when conflict has been for principles to which she clings, as to the last vital drop that visits the heart. She has seen that probably for centuries to come, all the contests of that Aceldama the European world, will be contests of inveterate power, and emerging right. Wherever the standard of freedom and Independence has been or shall be unfurled, there will her heart, her benedictions and her prayers be. But she goes not abroad, in search of monsters to destroy.

John Quincy Adams, 1821