What event led to the start of wwi in europe?

All it would take was one international event and Europe would be at war. On June 28, 1914, Archduke Franz Ferdinand, heir to the throne of Austria-Hungary, was assassinated in Sarajevo. The Austria government believed that the assassination was organized by the Serbian government.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

those sounds of the natural world are bioacoustics, and they're more than a false-color spectrogram of data from the musiamunat conservation area.