Answer: The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28. Within days, Germany declared war on Russia—Serbia's ally—and invaded France via Belgium, which then caused Britain to declare war on Germany.
The First Crusade (1096-1099 C.E.) was the most successful.
The African trade in gold and salt caused the Ghana Empire to rise to prominence, and the disruption of that trade led to its decline. During its time, Ghana was one of the richest polities in Africa.Though Ghana was not rich in natural resources itself, it was located along an important trade route between gold- and ivory-producing areas in the south and salt miners in the Sahara desert to the north. As a result of this strategically important location, Ghana became a wealthy entrepot.
Though the exact origins of Ghana are clothed in mystery, tradition places the empire's origins in the fourth century AD. By the ninth century, the area had become affluent according to accounts by Muslim traders who began to visit the area. These traders from the north continued to develop the trade, linking its gold resources with the vital markets in the Mediterranean region, and the empire grew larger by incorporating its neighbors.
The decline of the empire started in the 11th century, when the Almoravids, a militant confederation of Muslims, began to attack the empire and even conquered it for a time. Though their grip on power did not last long, the chaos they brought to the region destabilized trade, hurting the empire's sources of income. Decline ensued. The remnants of Ghana were incorporated into the Mali Empire in 1240.
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I think the Industrial Revolution led to the rapid growth of cities in the northeastern states because in this region were located the big factories and fabrics that introduced mass production as their form to produce goods.
Many people from the south. who lived in the rural areas of that region, decided to move to the larger cities of the northeast precisely to get a job in the fabrics. Many immigrants came to the United States to work in factories, They came from Europe and Asia. They went to New York or Chicago, and many other cities.
Of course, the population grew and these workers, as they were poor, they had to live in poor overcrowded spaces with no ventilation at all and where disease spread quickly and easily.
