Final answer:
The groundbreaking collection of poems that showcased Coleridge's friendship with Wordsworth was titled 'Lyrical Ballads', published in 1798.
Step-by-step explanation:
Coleridge's friendship with Wordsworth was manifested in the publication in 1798 of the revolutionary collection of poems titled Lyrical Ballads. This collaboration between Samuel Taylor Coleridge and William Wordsworth stands as a milestone in English romantic poetry. Wordsworth's extensive roaming of England and Wales, self-studies, and appreciation for nature, as well as the profound impact of the revolutionary spirit he encountered in France, became central inspirations for his work. His partnership with Coleridge in producing Lyrical Ballads highlighted the ideals of the Romantic Era, characterized by revolutionary zeal and an emphasis on emotional expression and the beauty of the natural world.