Good morning!  Have you ever heard someone speak with a thick accent and wondered where accents come from?  It turns out there is an entire field of study focused on accents.
I have heard of people speak with accents, but had no idea it was an area of study!
Yes, it's called sociolinguistics.  Accents appear even within languages so there are numerous accents within the English language across regions. 
DO they know what causes these different accents?
Regional accents of English
Spoken English shows great variation across regions where it is the predominant language. This article provides an overview of the numerous identifiable variations in pronunciation; such distinctions usually derive from the phonetic inventory of local dialects, as well as from broader differences in the Standard English of different primary-speaking populations.
Accent is the part of dialect concerning local pronunciation. Vocabulary and grammar are described elsewhere; see List of dialects of the English language.
Secondary English speakers tend to carry over the intonation and phonetics
analysed by Johnson's team both for content and for where it was reported. "Perhaps the most remarkable finding in the Voices study is that the English language is as diverse as ever, despite our increased mobility and constant exposure to other accents and dialects through TV and radio". When discussing the award of the grant in 2007, Leeds University stated:
Dialects Regional.
Most people in Britain speak with a regional accent or dialect. However, about 2% of Britons speak with an accent called Received Pronunciation (also