IndexThe First Human MigrationsThe Bronze AgeThe Iron AgePortuguese ColonizationThe Industrial AgeThis is a chronology of different points in history, including the first human migrations, the Bronze Age, the iron age, Portuguese colonization and industrial times. I talk about different points of history to know where we come from. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original EssayEarly Human MigrationsEarly human migrations are the first migrations and expansion of ancient and modern humans across continents. It all began 2 million years ago with the migration of Homo erectus from Africa. Climate change has affected migration by causing a 21,000-year wobble in the Earth's axis, meaning that at times northern Africa and the Arabian Peninsula would have less sun but more rain, creating greener, wetter landscapes and more possibilities of human expansion. They spread rapidly along the coast to India and reached Southeast Asia and Australia about 50,000 years ago. A little later, 50,000 years ago, a later group appears, planning an excursion inland from the tropics to reach the Middle East and southern Central Asia. They were ready to inhabit the northern latitudes of Asia, Europe and beyond. About 20,000 years ago a small band of Asian hunters took the storm, entering the East Asian Arctic during the Last Glacial Maximum. At this point the great ice sheets that covered the far north had sucked much of the earth's moisture into their huge expanses of ice. Sea level had dropped by more than 91 metres. This showed a bridge connecting Asia to America. The hunters crossed it, 15,000 years ago they had entered the land under the ice and within 1,000 years they had reached the tip of South America. Some may have even made it by sea. The Bronze Age The Bronze Age is an ancient period described by the use of bronze. An ancient civilization is defined as being in bronze by producing bronze from bronze production by smelting its own copper and mixing it with tin, arsenic, or other metals, or by trading for bronze from producing areas elsewhere. Bronze is harder and stronger than other metals obtainable at the time, allowing Bronze Age civilizations to gain an advantage. The beginning of the period is sometimes called the Chalcolithic (copper-stone) age, referring to the early use of pure copper along with its earlier tool-making material, stone. It was rare at first, originally copper was only used for small or valuable items. Its use was known in eastern Anatolia by 6500 BC and soon became common. Few tools are made at first, but by 1200 BC bronze replaced all stone tools. When bronze proved better than copper, it was abandoned as the metal of choice for tools. Bronze became important because it was strong. The Iron AgeThe Iron Age is the period following the Bronze Age. Its production occurred in Anatolia at least as early as 1200 BC. Most of Europe, Asia and Africa reached the Iron Age by 500 BC. Iron is easy to find, but difficult to turn into tools. It melts at a higher temperature than bronze. When blacksmiths learned to make iron tools, they were able to make many of them. With better tools, they could do more. Some people developed coins to buy and sell their crops and iron tools. Portuguese Colonization The Portuguese sought a route to Asia by sailing around Africa. They were under the control of Prince Henry the Navigator and discovered.