Geographic isolation and different living conditions.
Explanation:
Both the Neanderthal and the Homo sapiens shared the same ancestor, the Homo erectus. The Homo erectus managed to spread from Africa to Eurasia. The populations started to become geographically isolated from each other, and over time this caused speciation.
The Homo erectus from the far East, with the one from Europe, or the one from Africa, didn't had contact. This was due to big distance and natural barriers. Gradually this species was evolving, and because of the different living conditions and the geographic isolation at different places it started to develop different characteristics. This has led to evolution of different species over time, with the Neanderthal evolving in Eurasia, as well as the Denisovan Man, while in Africa it was the Homo sapiens that emerged.
Answer: the Byzantines were able to maintain their main areas. There were no attacks by tribal or pastoral people on Anatolia or Egypt, and just a few in the Black Sea region. For the most part the Byzantine Empire was not an expansionist empire, and this gave it more stability.
The tax system and the bureaucracy were already in place, and the bureaucracy acted as a check on the nobility. It was good way for them to earn reputation by serving in the government. Under Justinian, a law code was created. It came directly from the emperor, establishing him as the ultimate authority on justice. This was an important check on the power of the nobility as well , helping to keep them from growing powerful enough to attempt to take over the central government. It gave the imperial office a lot of authority and prestige.
Outside of Constantinople we see evidence of a strong agricultural economy. Although there were many large urban areas, the vast majority of the empire was made up of agricultural villages. They were the primary tax source and they supplied grain and agricultural products to the urban populations. At the same time, the Byzantines were the best economy in the region. They were the major trading power in the Mediterranean. They produced goods like textiles (especially silk), jewelry, and other crafts, but they also acted as the middleman for trade between east and west.
A growing cultural identity and social unity. The elements of this unity included, first and foremost, a long-lasting Roman identity. Byzantines believed they were keeping in the glorious Roman tradition, and they always presented themselves this way. Constantinople was also an important item of Byzantine unity. It was seen as the greatest city in the Mediterranean world and had overcame dozens of attacks. It was also portrayed as a whole Christian city, even if this wasn't actually true. There were lots of different kinds of Christians, plus Jews and later Muslims.
At the beginning of the war, the Confederacy chose a more defensive strategy while the Union chose an offensive strategy. The defensive strategy of the Confederacy did not work against the strength of the Union army and the Union was able to make successful raids on Confederate territory. After a while, the Confederate army grew weaker and the Confederate President Jefferson Davis decided to switch to an offensive-defensive strategy that allowed Confederate territories to be protected but also allowed for strategic offensives or counteroffensives. The Confederacy didn't want to take Union territory, they just wanted to survive and defend it's right to secede. The strategies of the Confederacy could not work against the strength of the United States.
The Civil War revolutionized the concept of war. There were many technological advancements including the telegraph, railroads, trench warfare, hot air balloons, and ironclads. In my opinion, the most important of these was the telegraph. This invention allowed almost instant long-distance communication. If an armies telegraph wasn't working the outcome of the battle could dramatically change. The Union had a more reliable telegraph system than the Confederates, this could have been a major contribution to the North's victory. While railroads were invented in 1825, they were never really popular before the Civil War. During the Civil War, both North and South could move men, weapons, and food to there armies. The first balloon flight was in 1783. The Civil War was the first war to use air balloons for reconnaissance and artillery spotting. Trench Warfare was introduced during the war which prolonged fighting. Ironclads drastically advanced naval warfare because they were nearly impossible to sink.
Liu yuan
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