The assassination of Archduke Franz Ferdinand might not have been a major international incident if

austro-hungary

Explanation: If they didn't declare war hours after the assassination

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.