The thing is Yale, Harvard, Princeton, Army are all from another era. That was a very different time in college sports and one where these schools will likley never get back to. Yale, Harvard, Princeton, Cornell, etc are schools that are looking for schoalr atheltes. It seems these days many elite football players are looking at Football as their major and other academics as secondary.
Army is well the army. Graduating from Army means a stint in the military and many elite football players want to go to the draft immedialty and into the NFL. Very few would want to go serve in the military for a few years-especially their good football years.
Many of the schools you mentioned: Texas, Bama, Nebraska, etc are BIG schools with Big time football endowments. Big football endowmnets means good facilities, good trainers for injuries, good coaches to develop you, and most importantly a national stage to be seen by the NFL scouts. How many times have you heard of an outstanding player that went to a small school and thus was passed up by many teams(and several rounds) in the draft?
I was being sarcastic. Of course the times have changed. I don't think any of the Ivy-Leaguers have won the National Championship in the last 30-50 years. Army still puts out some good players from time-to-time, but they are nothing of the likes of the big-name state/private schools (USC, Nebraska, Oklahoma, Ohio State, Notre Dame, Miami, etc.). One of my measuring sticks has always been MNF when the players give their name and school. Players come from all over the country, but you start to see a pattern. Look at the Texans, for example:
93 Babin, Jason DE 6-2 259 3 Western Michigan
3 Brown, Kris K 5-11 206 8 Nebraska
24 Brown, C.C. S 6-0 208 2 Louisiana-Lafayette
87 Bruener, Mark TE 6-4 260 12 Washington
8 Carr, David QB 6-3 230 5 Fresno State
43 Cook, Jameel FB 5-10 237 6 Illinois
75 Dalton, Lional DT 6-1 315 9 Eastern Michigan
81 Daniels, Owen TE 6-3 247 R Wisconsin
36 Dayne, Ron RB 5-10 245 7 Wisconsin
26 Earl, Glenn SS 6-1 215 3 Notre Dame
54 Evans, Troy LB 6-3 243 5 Cincinnati
38 Faggins, Demarcus CB 5-10 178 5 Kansas State
35 Gado, Samkon RB 5-10 226 1 Liberty University
56 Greenwood, Morlon LB 6-0 238 6 Syracuse
55 Hodgdon, Drew C 6-3 309 2 Arizona State
80 Johnson, Andre WR 6-3 219 4 Miami (FL)
96 Johnson, Thomas DT 6-2 298 2 Midd. Tenn. State
94 Kalu, N.D. DE 6-3 265 10 Rice
86 Lewis, Derrick WR 6-2 185 1 San Diego State
33 Lundy, Wali RB 5-10 214 R Virginia
13 Mathis, Jerome WR 5-11 191 2 Hampton
20 McCleon, Dexter CB 5-10 195 9 Clemson
76 McKinney, Steve C 6-4 302 9 Texas AM
84 Moulds, Eric WR 6-2 210 11 Mississippi State
53 Orr, Shantee LB 6-0 250 4 Michigan
71 Pearson, Mike OL 6-7 302 6 Florida
98 Peek, Antwan DE 6-3 250 4 Cincinnati
48 Pittman, Bryan LS 6-3 270 4 Washington
69 Pitts, Chester G/T 6-3 320 5 San Diego State
51 Polk, DaShon LB 6-2 242 7 Arizona
88 Putzier, Jeb TE 6-4 256 5 Boise State
23 Robinson, Dunta CB 5-10 174 3 South Carolina
59 Ryans, DeMeco LB 6-2 236 R Alabama
74 Salaam, Ephraim T 6-7 300 9 San Diego State
30 Simmons, Jason S/CB 5-9 198 9 Arizona State
7 Stanley, Chad P 6-3 205 8 Stephen F. Austin
85 Walter, Kevin WR 6-3 214 4 Eastern Michigan
70 Weary, Fred G 6-4 308 5 Tennessee
92 Weaver, Anthony DT 6-3 280 5 Notre Dame
90 Williams, Mario DE 6-7 291 R N.C. State
73 Winston, Eric OT 6-7 310 R Miami (FL)
52 Wong, Kailee LB 6-2 250 9 Stanford
25 Wynn, Dexter DB 5-9 175 3 Colorado State
A lot of good schools represented there who are recognized as consistently putting out pro football players (Nebraska, Miami, Notre Dame).
Somebody had asked for a list of teams, which is all I was trying to deliver.