I believe that is called archipelago
The above system of United States Constitution is showing three organs of the state i.e Legislative branch, Executive branch and the Judicial branch.
And below each division, their works are given. Aswecan were that, each of the organ is at same height which shows that they are practicing equal powers and they don't interrupt in each others work.
They practice the system of <u>Checks</u><u> </u><u>and</u><u> </u><u>Balances</u> to ensure that none of the organ is enjoying and grabbing too much.
So, the most appropriate option is:

Checks and balances system.
And, we are done !!
#CarryOnLearning...
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Answer:
The high number of British casualties needed to win at Guilford Courthouse
Calhoun argued that the US Constitution was based on a pact by 13 sovereign states.
Step 1 -war with Denmark
Step 2 - Australian-Prussia War
Step 3 -Creation of the Northern German Confederate- 1867
Step 4 -Franco-Prussian War