Emphasis and force:
* Assert: This implies a strong statement of belief or fact.
* Proclaim: This suggests a public declaration with authority.
* Declare: This is a general term for making a statement, but can be used with vigor.
* Insist: This implies a forceful demand or insistence.
* Demand: This is used for making a strong request or requirement.
Other options:
* Shout: This implies a loud, forceful statement.
* Cry: This suggests a passionate, emotional declaration.
Example:
* "She asserted her innocence to the court."
* "The king proclaimed war on the neighboring kingdom."
* "He insists that he is telling the truth."
The best word to use will depend on the specific situation and the intended meaning.