There are (3) different types of reasons that King provides in his letter to justify his presence in Birmingham

Organizational:

“I, along with several members of my staff, am here because I was invited here”

King notes that one of the SCLC's affiliates in Birmingham had invited the SCLC to “engage in a nonviolent direct-action program” when racial issues grew difficult there.

Justice:

“I am here because injustice is here."

Bring togetherness of people from all backgrounds:

“all communities and states” are interrelated