Final answer:
Influential writings from the revolutionary era supporting nationalism and liberty, alongside the Republic of Letters, were of lasting importance.
Step-by-step explanation:
The type of writing that was of lasting importance in the revolutionary era was one that supported the rising tide of nationalism and called for independence and liberty. The stirring pamphlets and transformative documents of the time, such as the Declaration of Independence and pamphlets by influential thinkers, were instrumental in shaping public opinion and the political landscape. The Republic of Letters was significant, as it was a network of writers and intellectuals who exchanged ideas, information, and debates that transcended the boundaries of the nation-states and contributed to the circulation of Enlightenment ideas.