Persia and its associate Media expanded the Empire to stretch from today's Libya in the west to Pakistan in the east. It held this empire together for two centuries by maintaining internal and external security by mobilising local forces, reinforced by Persian-Median central forces. It also maintained a strong naval force even though it had no maritime forces by mobilising the navies of Phoenecia, Egypt and the Greek city-states within its borders.
The king who led his army to the north was Alexander the Great. He was the king of the ancient Greek kingdom of Macedon, and he is considered one of the most successful military commanders in history. He is known for his strategic and tactical military genius, and for his expansive conquests. Alexander's invasion of the Persian Empire began in 334 BC, when he crossed the Hellespont with his army. He then marched north to Anatolia, where he defeated the Persian forces at the Battle of Granicus. He continued north, conquering regions of the Persian Empire including the Libyans, Phoenicians, and Syrians. He eventually reached the limits of the Persian Empire, and reached the western shores of the modern-day Caspian Sea. He then turned south and conquered the Babylonians, Susiana, and the Persians. Finally, he marched east, and eventually reached India.
First by conquest, then by maintaining peace internally and providing protection externaliy.
The Aztec Empire is long gone, it expired centuries ago, so it is not an empire of any kind, it is just a former empire. And when it existed it was not a military empire in the modern sense of the term; it was ruled by an emperor, not by a general. Of course, it did have military power and did enforce its rule by force. All empires share the characteristics of the military, to some extent.
Cyrus the Great, then his son Cambyses, then Darius.
King Cyrus the Great.
Best is Herodotos The Histories.
The Incas mainly united their empire so that they could combine their industrial and military advancements. They were able to better accomplishments due to advanced roadways and a government headed by the Sapa Inca and the regional heads below them.
It established peace, stability and improved prosperity within its empire.
A couple of hundred years of relative peace and prosperity.
Asia Minor was part of the Persian Empire. Alexander the Great took the Persian Empire by military conquest.
Cambyses added Egypt-Libya to the Persian Empire.
He took over Egypt and Libya, incorporating them into the Persian Empire.
Susa, Persepolis, Babylon, Susa, Memphis, and a hundred Greek cities in Asia Minor.
The goal that they had in common was to conquer the Persian empire.
An attempt to promote peace, prosperity and security which lasted for two centuries.
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The Persian Empire