This list may have a few missing recent results but overall should be pretty acurate:
PBs JAN 2012 to Present (aka past 2 years)
Kenya 14 sub 3:35s
01) 3:28.88 Asbel KIPROP
02) 3:29.63 Silas KIPLAGAT
03) 3:29.77 Nixon Kiplimo CHEPSEBA
04) 3:31.00 Bethwell BIRGEN
05) 3:31.61 Benson SEUREI
06) 3:32.08 Collins CHEBOI
07) 3:32.39 Caleb Mwangangi NDIKU
08) 3:32.98 Daniel Kipchirchir KOMEN
09) 3:33.20 Lawi LALANG
10) 3:33.31 James Kiplagat MAGUT
11) 3:33.39 Geoffrey BARUSEI
12) 3:33.81 Eliah KIPTOO
13) 3:33.83 Gideon Mwangi GATHIMBA
14) 3:34.70 Augustine Kiprono CHOGE
USA 13 sub 3:35s
01) 3:31.96 Matthew CENTROWITZ
02) 3:33.14 Leonel MANZANO
03) 3:34.00 Jordan McNAMARA
04) 3:34.11 Russell BROWN
05) 3:34.12 Garrett HEATH
06) 3:34.19 David TORRENCE
07) 3:34.47 Andy BAYER
08) 3:34.55 Lopez LOMONG
09) 3:34.60 German FERNANDEZ
10) 3:34.63 Bernard LAGAT
11) 3:34.75 Galen RUPP
12) 3:34.78 Robby ANDREWS
13) 3:34.93 Cory LESLIE
Clearly most of USA's marks are 3:34 but still 13 sub 3:35s is impressive