Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Detailed result lists can be found on the CFPI and on the "World Junior Athletics History" website. An unofficial count yields the number of about 330 athletes from about 29 countries: Antigua and Barbuda (3), Argentina (6), Bahamas (11), Barbados (8), Bermuda (1), Belize (1), Brazil (18), British Virgin Islands (2), Canada (61), Cayman Islands (3), Chile (20), Colombia (7), Costa Rica (1), Dominica (2), Ecuador (4), El Salvador (2), Grenada (4), Guatemala (5), Guyana (2), Jamaica (32), Mexico (13), Panama (1), Peru (4), Puerto Rico (12), Trinidad and Tobago (8), Turks and Caicos Islands (10), United States (78), U.S. Virgin Islands (2), Venezuela (9).
Medal summary
Medal winners are published.
Complete results can be found on the CFPI and the on the "World Junior Athletics History" website.