Successful: Medicare and Medicaid and the National Endowment for the Arts
Unsuccessful: Model Cities Program, Office of Economic Opportunity
Many of the programs were unsuccessful due to the cost of the Vietnam War and not because they were bad ideas.
What makes a source credible is it has backed up information. Basically, it has to have supporting details so you know its true.
The declaration contained 3 sections: a general statement of natural rights theory and the purpose of government; a list of grievances against the British King; and the Declaration of Independence from England I’m not sure if that’s what you’re looking for but that’s some information if you need it