The activities that most demonstrated Americans' belief in Manifest Destiny occurred during the 19th century, while thousands of settlers moved west and displaced thousands of natives.
The Gulf of Tonkin Resolution allowed President Johnson to send troops to Vietnam, thus waging a war without actually "declaring" it as war. Checks and balances keep the power divided and balanced among government branches; it is the duty of Congress to declare war, so President Johnson waging war without the declaration of war by Congress breaks this system.
The statement is True.
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