West Balochistan was invaded and annexed by Iran in 1928. <ref>https://www.files.ethz.ch/isn/180927/31c68a20991b5a98b0dece4fd929c9c8.pdf</ref>
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West Balochistan was invaded and annexed by Iran in 1928. <ref>[https://www.files.ethz.ch/isn/180927/31c68a20991b5a98b0dece4fd929c9c8.pdf The Baluch insurgency: linking Iran to Pakistan], ''The Sistan and Baluchistan Province of Iran has long been associated with instability and armed conflict.'' NOREF (PDF)</ref>