Can you help me on the history of the UK? What was the Regency period? I see a lot of it when they talk about literature (Jane Austen is one of the main). Sorry, I’m not American or English, and I’m curious about that term.

Sure thing. The Regency period (1795-1837) refers to the period when George III was deemed unfit to rule, leading to his son (the future George IV) being declared Prince Regent, through to the reign of George IV. 

In terms of politics, cultural and literary and architectural trends, social structure and mores, etc. the Regency period is distinguished from the earlier Georgian period (1717-1795) and the later Victorian period (1837-1901).