Here's some history. Americans won the Junior individual titles four years in a row from 1974-77. The best U.S. team showing since 1997 (don't have stats before then) was 4th place in 2001, when Dathan Ritzenhein placed 3rd, and the winner was Kenenisa Bekele.
2008
1st Kenya, 21
2nd Ethiopia, 28
3rd Uganda, 37
6th USA, 138
01 Ibrahim Jeilan, 22:38
02 Ayele Abshero, 22:40
25 German Fernandez , 24:15
26 Emil Heineking, 24:16
35 Kevin Williams, 24:34
52 Ryan Sheridan, 25:03
72 Benjamin Johnson, 25:37
86 Robert Moldovan, 25:49
2007 - DNS
01 Asbel Kiprop, Kenya, 24:07
56 Kenny Klotz, USA, 27:11
2006 – 9th
01 Mang’ata Kimai Ndiwa, KEN, 23:53
34 Kiel Uhl, USA, 25:31
2005 – 7th
01 Augustine Kiprono Choge, KEN, 23:59
20 Galen Rupp, USA, 25:05
2004 – 7th
01 Meba Tadesse, ETH, 24:01
34 Ryan Deak, USA, 26:27
2003 – 8th
01 Eliud Kipchoge, KEN, 22:47
26 William Nelson, USA, 24:52
2002 – 7th
01 Gebremariam Gebre-egziabher, ETH, 23:18
30 Koborsi Rod, USA, 25:14
2001 – 4th
01 Kenenisa Bekele, ETH, 25:04
03 Dathan Ritzenhein, USA, 25:46
2000 – 9th
01 Robert Kipchumba, KEN, 22:49
28 Franklyn Sanchez, USA, 24:45
1999 – 6th
01 Hailu Mekonnen, ETH, 25:38
24 Fasil Bizuneh, USA, 28:02
1998 – 7th
01 Million Wolde, ETH, 22:47
20 Ryan Shay, USA, 24:22
1997 – 14th
01 Elijah Korir, KEN, 24:21
51 Abdul Alizindani, USA, 26:58
1977
01 Thom Hunt, USA
1976
01 Eric Hulst, USA
1975
01 Bob Thomas, USA
1974
01 Rich Kimball, USA