Dee ihe na-aga n'ihu maka paragraf a - Ọrụ ndị ọrụ mgbaàmà na Spanish-American War nke 1898 na Philippine Insurrection na-esote
bụ n'ọkwa dị elu karịa ka ọ dị n'oge Agha Obodo. Na mgbakwunye na akara ngosi anya, gụnyere heliograph, ndị agha ahụ nyere ekwentị na telegram waya waya na eriri nkwukọrịta, na-akwalite iji ekwentị na ọgụ, na-eji foto ọgụ, ma na-emegharị ojiji nke balloons. N'oge na-adịghị anya mgbe agha ahụ gasịrị, Signal Corps wuru Washington-Alaska Military Cable and Telegraph System (WAMCATS), nke a makwaara dị ka Alaska Communications System (ACS), na-ewebata telegraph mbụ na-enweghị eriri na Western Hemisphere.