For undergraduate school, he attended a top ranked National University which had the number one rated / ranked program in his primary major.
My impression is that you just need a little more “breathing room” than that offered at Dartmouth College. Essentially, this translates to a need for more diversity & more social options. You will find this at Northwestern University, Michigan, & Cornell, as well as at most other schools which I have suggested below. The College of William & Mary might be of interest to you.
SESP (School of Education & Social Policy) at Northwestern University might be of interest to you. Best program in the nation. Flexible degree / flexible career options / great preparation for law school or other graduate schools in education / political science realm. Tight knit group of diverse students in this LAC-like school within a large top 10 National University. Students can double or triple major at Northwestern. Easy to transfer among schools once admitted to NU.
He would have been very happy at Dartmouth, but the emphasis on the social life affected our collective (family) opinion at the time.
And, personally, I have always clicked with every Dartmouth College graduate or student whom I have met–but all were met outside of the Dartmouth social scene at various stages of life over several decades.
Not sure, but you may like Brown University, Harvard College, Cornell, Northwestern, Rice University, Middlebury College, the University of Vermont Honors College, Vassar College, Grinnell College, Macalester College, Carleton College, Pomona College.
The University of Michigan. The College of William & Mary. Tufts University. University of Texas at Austin. University of Georgia (more sophisticated than one unfamiliar with the area might think).
Notre Dame & Boston College may be of interest to you.
Recently, I visited American University in Wash DC. Was very impressed by the students & by the campus (just 84 acres). Offers transfer scholarships. Dry campus. Attractive students. Non-commercial location, however,so no college town environment. Beautiful residential section of Wash DC. Easy commute via public transportation everywhere. Lots of internships & externships.
I hope this information is helpful to you.