the french fur trade
The so-called Black Death that decimated populations in the 14th century started in central Asia and moved towards Europe by way of the Middle East. So Persia's population was also hit by it. By then Persia had become part of the Mongolian Empire.
Alexander was so Successful at spreading his empire because he was Very clever, intelligent, brave and was a fierce warrior. Also he had good strategies.
Beaver
Yes, the Russian empire was comprised of a multi-ethnic population.
The landform that stopped the Persian Empire from spreading north was the Caucasus Mountains. The rugged terrain and harsh climate of the Caucasus made it difficult for the Persians to conquer territories beyond this natural barrier.
Romans! And any of the local populations that were not Roman citizens.
The roman empire itself. But disciples like Paul assisted in spreading the gospel.
No. The Spanish killed the Incas by spreading the "smallpox" around the Incan empire.
The conquistador Hernán Cortés (aka Hernando Cortez 1485-1547) conquered the Aztec empire in 1519 (and again in 1521) , and the tribes were subsequently decimated by European diseases such as smallpox.
BThe Mongol Empire established policies that placed extra burdens on native populations in both Russia and China. Apex.
Beaver.
The Safavids were dealt a devastating defeat that checked the westward advance of Shi'ism and decimated the ranks of the Turkic warriors who had built the Safavid empire.