“America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves.”
First attributed to Lincoln in 2002, this seems a paraphrase of a statement in the Lyceum address of 1838, while incorporating language used by Thomas E. Dewey (c. 1944), who said "By the same token labor unions can never be destroyed from the outside. They can only fail if they fail to lend their united support to full production in a free society".
Misattributed
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Abraham Lincoln 618
16th President of the United States 1809–1865Related quotes

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Context: I say to you that our goal is freedom, and I believe we are going to get there because however much she strays away from it, the goal of America is freedom. Abused and scorned though we may be as a people, our destiny is tied up in the destiny of America.

Quoted from Margaret Thatcher, Article for Newsweek “Don’t undo my work” (27 April 1992).
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The National Times, Australia, (March 1, 1977)