Question

What word at the beginning of the declaration of independence shows that all 13 states agreed with the declaration?

Answer 1

Answer: one (people)

The first sentence contains the phrase
"it becomes necessary for one people to dissolve the political bands which have connected them with one another".
This phrase indicates that the 13 colonies came to an agreement to have the voice of "one people" and to dissolve political bands or cords that connected them.