John Locke was an English philosopher and physician, widely regarded as one of the most influential of Enlightenment thinkers and commonly known as the "Father of Liberalism".
Article IV section 2 of the United States Constitution includes the Privileges and Immunities Clause. However, in addition to this, it also contains the Extradition Clause and the Fugitive Slave Clause.
The Extradition Clause states that a person charged in any state with treason, felony or other crime and fleeing from justice is found in another state, may be extradited to the state from which he fled on request of the executive authority of that same state.
The Fugitive Slave Clause stated that fugitive slaves who scaped to a different state were not to be liberated, but to be returned to their masters. However, the clause was rendered moot when the Thirteenth Amendment abolished slavery.
The answer would be that president Nixon resigned in 1974 after the Watergate Scandal.
I’m not sure how much this can help but reciprocity would be returning what one gives to you. So in a relationship, you care for the person as much as they care for you