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A lot of Bosnian Muslim originated from Serbia, during the 19th century vast majority Muslims from Serbia excaped to Bosnia.
Užice, Valjevo, Loznica, Rudnik, Smederevo, Požarevac, Belgrade, Šabac, Soko... had Muslim majority before 1833. Muslim Serbs were 1/3 of populatin of Belgrade pashaluk. Mihailo and Miloš Obrenović agreed with sultan that Muslims moved from Serbia, and they went mostly to Bosnia.
Muslims from Srebrenica and region around Srebrenica came from Užice (western Serbia) in year 1861. A lot of Muslims from Tuzla, Semberija, Podrinje and whole eastern/northeastern Bosnia came from Serbia in 19th century. Among Bosnian Muslims exist surnames Užičanin and Valjevac (because they originated from Užice and Valjevo in weastern Serbia).
Town Bosanska Kostajnica in northwestern Bosnia was founded by Muslim refugees from Valjevo (western Serbia) in 19th century.
I know one Bosniak from Bijeljina, his ancestors came from Požarevac in Serbia i early 19th century.
https://en.wikipedia.org/wiki/Serb_Muslims
Croats never converted to Islam, because vast majority of them lived under the Austrian and Venetian rule.
Origin of Bosnian and Herzegovinia Croats is dusputable, they are very I2-PH908 population and real chakavian Croats have very few I2-PH908. Chakavian Croats are predominantly R1a-Z280>Y2613. I did not see that Croatian marker R1a-Z280>2613 exist among Bosnian Muslims neither among Bosnians Croats, both are predominantly I2-PH908, they also have some R1a but not Y2613.
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