What happened on this land around c. 1715–1783 CE (18th century turmoil and reorganization)?

Short-lived restoration under Nader Shah; rapid fragmentation and dynastic contests after his death.
Rulers
Afsharid (Nader Shah), Zand, early Qajar ascendancy
mid-18th century onwards
Nader Shah briefly reunites much of Iran; after his death, regional dynasties (Zand, Qajar) contest power.
Battles
Nader Shah's campaigns
1736–1747
Nader's military campaigns reassert central power briefly across Iran and into the Caucasus/India.