Mezue ahịrịokwu na-esonụ: Site na 1980 ruo 1990, Preston bụ onye nta akụkọ na-ekpuchi agha agha na Central America, gụnyere
agha obodo na El Salvador na ndị na-emegide ndị nnupụisi, nke United States kwadoro, megide gọọmentị Sandinista na Nicaragua. Ọ kọrọ akụkọ banyere Central America maka The Boston Globe site na 1983 ruo 1985 na maka The Washington Post site na 1985 ruo 1990.