What does the us allows its citizens to do?

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

c 3 branches because idk why they had 3 well when:

you think of it there are still contrys with 3