[2] Historians consider it a highly accurate political history of the early Republic, but with a strong bias in favor of the Federalist Party and the abolition of slavery.
In 1838 he resumed his editorial duties on the Atlas, but in 1840 removed, on account of his health, to British Guiana, where he lived for three years and was editor of two weekly newspapers in succession at Georgetown.
[7] Between 1857 and 1860 Hildreth worked for the New York Tribune and during the same period he wrote several anti-slavery tracts for the fledgling Republican party under various pseudonyms.
As a meed Massachusetts Governor Nathaniel Prentiss Banks and Senator Charles Sumner successfully lobbied for Hildreth's appointment as the United States consul at Trieste in 1861.
He is buried near Theodore Parker in the English Cemetery, Florence In an overview of writings by and about Hildreth, OCLC/WorldCat lists roughly 270 works in 870+ publications in 11 languages and 12,800+ library holdings.