Why did italy fear that france would invaded them that lead them to join the alliance with austria and germany.

The treaty provided that Germany and Austria-Hungary were to assist Italy if it was attacked by France without provocation. In turn, Italy would assist Germany if attacked by France. In the event of a war between Austria-Hungary and Russia, Italy promised to remain neutral. The existence and membership of the treaty was well known, but its exact provisions were kept secret until 1919.

it further strained relations between the north and the south and convinced

sonar maybe? ? i dont know the choices