Merging Panel data with two different splits. Is it possible?
I would just merge them horizontally... so that the main dataset is the second one, and you include country-wide statistics into each row:

ID  Year  State  xx1  xx2  xx3   x1  x2  x3
A1  2000   AL    581  135  1.22  10  11  12
A1  2000   FL    584  51   1.5   10  11  12
A2  2000   AL    5138 84   1.7   13  25  20
...