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To be a worthy nation here on earth, there are certain qualities that are essential.

1. It must establish its own unique Identity


2. The nation must be able to maintain Order


3. It must have checks and balances that are suitably Paired


4. Finally, it must, without a doubt, be...
   
   

   
   

   What?

   
   

   
   

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24

25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48

_{Any perceived omission(s) are intentional and necessary for the puzzle to work; they do not constitute a clue.}

Partial answer

1. It must establish its own unique Identity

These are the lower 48 US states. some are rotated. I have Identified them in the reordered list below to avoid posting several 48-row lists.

2. The nation must be able to maintain Order

I have rearranged them to reflect the Order they joined the Union:
list number - abbreviated state, union join number, color, rotation
19 - DE 1 black 180
18 - PA 2 white 180
12 - NJ 3 black 90
37 - GA 4 white 90
27 - CT 5 black 0
32 - MA 6 white 90
30 - MD 7 black 0
08 - SC 8 white 90
36 - NH 9 black 0
44 - VA 10 white 90
24 - NY 11 black 90
21 - NC 12 black 180
41 - RI 13 white 90
02 - VT 14 white 0
28 - KY 15 white 0
20 - TN 16 black 270
47 - OH 17 black 180
23 - LA 18 white 180
45 - IN 19 black 90
15 - MS 20 black 180
46 - IL 21 white 90
31 - AL 22 black 90
43 - ME 23 black 90
29 - MO 24 white 180
38 - AR 25 black 180
35 - MI 26 white 0
26 - FL 27 black 90
25 - TX 28 white 180
48 - IA 29 black 180
09 - WI 30 white 90
13 - CA 31 black 180
16 - MN 32 black 90
33 - OR 33 black 90
11 - KS 34 white 180
05 - WV 35 black 180
22 - NV 36 black 90
17 - NE 37 black 180
34 - CO 38 white 90
10 - ND 39 white 0
04 - SD 40 white 180
06 - MT 41 black 90
14 - WA 42 white 180
39 - ID 43 black 180
01 - WY 44 black 0
03 - UT 45 black 90
40 - OK 46 white 90
42 - NM 47 black 180
07 - AZ 48 black 90

3. It must have checks and balances that are suitably Paired

8 of the states are not rotated, 4 black and 4 white. 21 of the states are rotated clockwise roughly 90 degrees, 9 white and 12 black. 18 of them are rotated 180 degrees, 7 white and 11 black. Exactly one state looks rotated 270 degrees clockwise, and it's black (TN).
The unrotated states make up the only set that is suitably Paired.

4. Finally, it must, without a doubt, be...

???

I have a hunch that the remaining 8 states somehow translate to the word Preamble, as the title, "A More Perfect Union," is a quote from the Preamble of the US Constitution. I'm unsure of that translation as of yet.

P.S. If anyone knows how to more cleanly show that list, feel free.